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