Here is the full list of all 83 Slime 3K: Rise Against Despot achievements.
Unlock every achievement!
Get a level 3 copy of Triangle of Darkness
Kill 999 Black Swordsmen
Unlock every ability
Kill 6000 Specters
Kill 3000 Brains
Unlock all Slime starting setups
Kill 30000 Tomatoes
Kill 10 Thornies
Kill 10000 Bees
Get a level 3 copy of Candy Bomb
Kill 300 Bots
Get a level 3 copy of Tiny Spring
Get a level 3 copy of Super Scytherang
Kill 5000 Doc Ocs
Get a level 3 copy of Supreme Gun
Kill 2000 Martial Arts Masters
Get a level 3 copy of Obedient Doc
Get a level 3 copy of Meteorite Satellites
Kill 100000 Newbies
Get a level 3 copy of "Heretic's Fork"
Get a level 3 copy of Homing Loogie
Beat level 10
Kill 3000 Ballerinas
Kill 666 Maniacs
Beat level 9
Get a level 3 copy of Disco
Beat level 8
Beat level 7
Beat level 6
Get a level 3 copy of Coin Launcher
Get a level 3 copy of Olive Gun
Get a level 3 copy of Bananarang
Kill 200 Shieldbearers
Beat level 5
Kill 300 Mantraps
Get a level 3 copy of Watermelon Launcher
Get a level 3 copy of Dark Side
Get a level 3 copy of Blaster
Get a level 3 copy of Caliperang
Get a level 3 copy of Fire Beam
Get a level 3 copy of Money Box
Get a level 3 copy of Scytherang
Get a level 3 copy of Supreme Shotgun
Get a level 3 copy of Obedient Zombie
Get a level 3 copy of Random Nails
Get a level 3 copy of Flashes
Beat level 4
Kill 1000 Stilt-Walkers
Get a level 3 copy of Needle Shotgun
Get a level 3 copy of Assault Rifle
Get a level 3 copy of Nuggets of Darkness
Kill 300 Pain Lovers
Get a level 3 copy of Shotgun
Kill 600 Laser Swordsmen
Get a level 3 copy of Fiery Horizon
Get a level 3 copy of Pistol
Get a level 3 copy of Rocket Launcher
Kill 666 Fire Mages
Beat level 3
Kill 1 Wheelman
Kill 50 Fridge Men
Beat level 2
Kill 2 Watchers
Kill 10 Madmen
Beat level 1