OK, bagdes are rated according to Super's scale of difficulty. All badges listed here i have, except the "uncomfirmed" ones.
E : Easy. These badges you'll get just playing the game.
M : Medium: These badge need you to hunt a bit for them.
H : Hard. You need to set up an actual farm, and organize an event to get them. Good luck.
U : Uncomfirmed: Bagdes i'm working on, but that i think are near impossible to get.
Electrician + Gremlin Gladiator (
M ): For Gremlins in Cap au Diable. The Gremlins are usually found at the electric transformators (6 total in the zone). You need about 200 of those, but appart for taking time, it's rather easy to get.
Fort Knox (
E ): This one is for Goldbricker. You'll get it just doing missions, don't worry.
Gangbuster (
M ): This one is for Marconne Bosses. It is a pain is the nuts to get, as you need 200. Port Oak will get you what you need, if you loop around downtown. Get this one before 35, as it opens a contact named Slot Machine.
Pirate and Spectral + Red Hand Gladiator (
M ): Get these bagdes by trapping ghosts. 50 gets you Pirate, and 100 gets you Spectral + gladiator. To trap a ghost, go into Port Oak. At the Arachnos fort, you must kill ghost
near the little trap machines in the fort. You'll know it works when you see the Greenish Ghost's essence enter the trap. They only come out at night, and the Pirate badge open Veruta Lunata as a contact.
Man in Black : (
M ): Kill 100 Shivans in Bloody Bay.
Strike Buster (
E ): Kill some scrapyarders. Rather easy, should get it just doing missions.
Hammer Down (
M ): Kill a lot more Scrapyarder, about 500. The Ghost of Scrapyard's posse is a great farm occasion.
Spider Smasher (
E ) : Kill low level Arachnos minions. The human ones (like Spider Enforcers). This should come by itself after a few missions.
Mongoose (
E ): Kill snakes. Like, 25, lol.
Coldhearted + Hellfrost Gladiator : (
M ): Kill 250 cold demons, either Hordeling Berzerker in Cap au Diable, or Hellfrost. I suggest getting Weed Wacker first with 100 Hellfrost, then complete with Horderlings...
Weed Wacker (
M ): Kill 100 Succubus OR Hellfrost. Best way is in the water by Villa Requin in Sharkead, there are many lvl 25-27 Hellfrost there, by looping about, you can kill 100 easily under 30 minutes.
Tank Buster + Tanker Smasher Gladiator (
M ) : Kill 100 Freakshow Tanker Smasher. Even with mission, you'll probably need to hunt a bit in Sharkhead.
Bonecrusher (
H ): Well, 50 bonedaddies... But they are very very rare, you'll find a few in Mercy if you hunt for hours. You need a farm. Indoor missions for Skulls can be chosen from the newpaper between lvl 5 and 15. Select a Skull mission. Get a team of 8. Put it on Ruthless. Farm it, about 10-12 runs should do it.
Kill Skuls : (
M ): 500 Skulls, you'll get it as you farm for Bonecrusher.
Finder + Anathema Gladiator (
M ): This is the badge for 100 Lost Bosses. Rather easy, as mission will get half your bar. When you get higher in level, Nerva's docs are the best way to farm these guys.
Gearsmasher + Cog Gladiator : (
M ): 100 Gears. There is a few rare missions with a few Clockwork bosses in them. But you can hunt Tesla/Assembler Princes outside too, in Cap au Diable, in the NE corner in teh industrial section. Another very good spot is Siren's Call, where there is a lot of lvl 20 Princes.
Gravedigger (
H ): It is possible to find 100 embalmed Vazhilok outside. They are found among vazhilok spawns in Cap au Diable, between Facemaker's shop and the Ferry. But, they are very frustrating to hunt, as they are not only rare, but will mostly blow themselves up as soon as you see them, to kill luddites. A much easier way to get this badge is to farm an indoor Vazhilok mission. They are rare, but the best known is the one that actually gives out the Mask Maker badge.
Hellspawned (
H ) : Yet another badge you'll need to set up a farm for. 100 Hellions Dammed CAN be hunted in Port Oak, but it's a very tiresome process. They are very rare. The best way is to, yet again, set up a farm. Hellions Indoor missions are available in the newpaper between lvl 5 and 12.
Legionnaire + Smasher Elite Gladiator (
M ): 100 Warrior Bosses are easy to find in Siren's call. What isn't easy is to hunt them with all the heroes trying to kill you. Go in with a full team for a better chance of success.
Privateer (
M ): 100 Skyraider Skiffs. Many available in Sharkhead island on the beach by the Pit, or at the Skyraider Base.
Regenerator + Caliban Gladiator (
H ): Everyone wants a Caliban gladiator, but where to find 100 Troll Bosses? Well, there is NO outside Trolls in CoV, so you need to set up a mission farm. Troll missions can be found in the newspaper between levels 10 to 15.
Silverbullet + Omega Wolf Gladiator : (
M ): 100 wolves... Well, council mission are available up to level 40, and you'll fight many council missions in story arcs too. But in case you wanna find some fast, Sharkhead Islands spawn mobs of wolfs on the beach near the Pit at night.
Slayer (
M ): 100 Council Vampiry. As said, you'll find plenty of council missions in the newspaper for all levels. A few rare ones to be found in Nerva near the Black Helicopter, but not worth hunting. Just do missions.
Soulbinder : (
M ): 250 CoT Mages. There is CoTs to fight your entire career, but getting this badge is rather easy in Cap au Diable. In fact, hunting CaD for Soulbinder/Electrician/Coldhearted is a nice way to save up time.
Tracer + Crane Enforcer Gladiator : (
H ): Alright, i rated this one hard because it's very tricky. You need 200 Tsoo Sorcerer. Since there are plenty of Tsoo in St-Martin and Siren's call, this sounds easy, right? Wrong. As i said, it's rather tricky.
Only lvl 29 and lower Sorcerers will count towards this badge. There is currently a coding bug that will indeed spawn lvl 29 sorcerer even in high level story arc Tsoo missions, so you can farm these. An easier way is to farm a newspaper mission, available for Tsoos in the 20-29 levels. Farming these missions for 200 teleporting LTs is a huge pain in the butt.
Swift Steel Gladiator (
H ): For this gladiator, you need 300 Tsoo Ancient Spirits. But this badge follows the same law as the Sorcerers: Only level 29 and under, so you need to farm an indoor mission. Long, and painful. Find a good patient 8 men team...
Red Ink Man Gladiator (
E ): At least this is an easy Tsoo bagde: about 75 Blue ink men. Easily found in missions, or outdoor St-Martial. The badge should come just doing arcs.
Untouchable (
M ): A long and boring hunt for 200 Regular family bosses (underboss/consigliere), more easily found on the Nerva Docks, but also in Sharkhead Island.
Razorvine Gladiator(
M ): Get this bad gladiator by hunting 300 grassy Devouring hurt minions (bladegrass, razorvines, blackroses). Rather easy once you can hunt in St-Martial, they spawn by east side or to the north.
Raider Enginer Gladiator (
M ): Destroy 100 Force Field Generator. Find Skyraider in Broker missions from 25 to 35, or in Sharkhead Island by the Pit or the Raider Base. TIP: to have the enginer pop a generator without killing them first, either kill someone close to them, or just give them 1 brawl shot.
Ember Legacy of Flame Gladiator (
M ) That's for 100 Legacy of flame low level minions. We are talking here Lument of light, Lument of Steel, or Lument of flames. The Thellus are too high and won't work. I rated this one Medium and not Easy because it is possible to solo the Legacy of flame mission without killing enough, specially if you don't clear maps. Once you passed those missions, it's not that easy to find one again.
Creay Power Tank Gladiator (
M ): 100 Crey Tanks (Lts or Boss) found in Nerva to the north of the big jungle island.
Fortunata Seer Gladiator : (
E ): I rated 100 Seer easy: they are everywhere in the game, and there are enough arachnos mission to ensure you'll get it.
Blue Coralax Hybrid Gladiator (
M ): 100 Blue coralax, easy to find in Port Oak.
UNCOMFIRMED SECTION
These are badges i have yet to acquire:
Visonnary : This is the bagde for Rularuu Overseer Bosses. 100 needed. In CoV, there is ONE mission, form Technician Naylor's arc, where we go to the Shadow Shard. I did this mission in a team of 8 on ruthless. The mission is huge, and there was are 1 Overseer per spawn. We were up to 19 kills, and still going, when we somehow FAILED the mission. A NPC got killed or something. But, 19 for 1 run is very good. Had i known, i would have stopped at 15, gotten out and reset. Just a few runs should sack up the Overseer badge. I'm on Protector if anyone has this mission (lvl 35-40 arc). NOTE: i have not found any progress bar about this badge, that should technicaly show 19% complete.... Hopefully i'll give you an update.
Banisher : 200 BP Masks.... Ah, but there is no BP in CoV. Or is there? Well, the only known spot for masks is in Nerva, by the Longbow Base Island. You will find some longbows on the beach fighting various vilains (freaks, DEs, Riktis). Sometimes, you will see a Mask. I have killed a big total of 5 so far, woo-hoo-hoo! If i ever kill 200, i'll let you know.
Ilusionnist : This is the Carnie Bagdes. Well, the ouside Carnies don't spawn Master Illusionnist. I've tried doing indoor story-arc missions in full teams: All bosses we found were Ring Mistress. So it seems there are no Master Illusionist in CoV. Let us know if you've had different experiences.
Infiltrator : I had only 1 crey mission, and i soloed it. So i don't know it PP spawn. Someone told me that you'll only get Crey Power Tanks. Maybe, since this isn't Paragon after all... Needs experimenting.
Monkeywrencher : Well, there are Hercule Titans in Warburg. They travel in patrols, and are grapes (lvl 41). Could a team fight them, and force them to combine into Zeus? Maybe. To be tested.
Protectorate : Well, since i6, DEs don't plant Eminators anymore. If a fix comes, maybe this badge will rise again.
Unveiler : There is a few Nemesis Missions to be had by Techician Naylor. I tried farming it, but i only got Warhulks. If anyone got some Fake Nemesis, please let me know.
I do remember killing ONE Fake Nemesis at the end of a mission (he was a named Boss). Could that be done 100 times for a boss? Maybe if you are insane
Zookeeper : There are very few Rikti missions in there somewhere. I did kill a few monkeys, and i do have a progression badge at about 2%. A good farm would be to find a lvl 29 toon, which can get Broker missions for Losts. Set it to Ruthless to get lvl 30+ mobs. And we know lvl 30+ Losts are Riktis. If anyone can confirm Zookeeper, please say so.
Bagde officialy not into the game :
Demon Slayer: Even with the crazy bugged lvl 43 Ambushes, my team managed to bring down Baphomet. Saddly, no badge for the kill.
Things i'm working on : I'm currently hunting down Wailer Queens and Kings, Consortium Captains, Arachnos Spiderlings, and Night Widows. I'll let you know if it leads anywhere. Let's not forget, some badge/gladiator actually need 300 of a type of kill...