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