Here is the full list of all 57 Kill to Collect achievements.
Complete the campaign with Riot Ray on Hard difficulty.
Complete the campaign with Ivan Ironfist on Hard difficulty.
Complete the campaign with Shocking Shelly on Hard difficulty.
Complete the campaign with Kate Katana on Hard difficulty.
Complete the campaign as Kate Katana.
Complete the campaign as Ivan Ironfist.
Kill a friend with the Rocketlauncher
Complete the campaign as Riot Ray.
Complete the campaign as Shocking Shelly.
Complete all chapters of the campaign in any way you like.
Complete a "One Try" Challenge.
Kill a Vanguard with a whip
Kill an enemy in a factory shredder.
Kill 4 or more with one rocket using the Rocket Launcher.
Kill a Defender with the Handcannon
Watch yourself being placed first on a leaderboard.
Deploy 4 turrets in a fight
Have your turret kill a Bounty Target.
Kill 8 enemies with one Lazer Cutter.
Complete a (not challenge, not tutorial) bounty in 350s or less.
Complete a floor ( not tutorial ) in 90s or less.
Complete a floor using just x -attack (Dodge is still allowed)
Hit 5 or more enemies at once with Kate Katanas Crackdown.
Complete a Repeatable Challenge
Gib one of every enemy in the game.
Blow 3 enemies up with a Grenade.
Kill 15 enemies with a Flamethrower.
Have an Artillerist die by his own grenades.
Kill an enemy with the last bounce of the laser disc.
Clear every challenge room in a bounty without dying.
Kill three enemies in one bull rush.
Revive a friend with less than 1sec left on the timer.
Hookshot 15 enemies.
Set fire to 3 enemies with one Incendiary Grenade.
Land 50 consecutive attacks in a row without taking damage.
Strangle someone to death with the LazerWhip
Kill 3 enemies with one Proximity Mine.
Beat a Challenge Room without taking any damage.
Kill 3 enemies with one use of Ironfists ultimate ability.
Land 20 consecutive attacks in a row without taking damage.