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