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