Here is the full list of all 23 Mayhem Triple achievements.
Kill 5,359.4 enemies.
Unlock every tontine treasure.
Get Georgia Close's number. You creep.
Discover the secret to defeating the bunny threat and save the world.
Stake 30 bunnies to a wall.
Save every hostage in the game.
Buy every available health upgrade and weapon holster.
Kill 10 enemies with a single sawblade.
Just beat it!
Finish the game without health upgrades.
Find a better way to kill a mech.
Cause 20 enemies to be destroyed by testicle bombs.
Taze a crotch rocket.
Permanently kill the birthed alpha bunny.
Destroy the helicopter in a special way.
Find the hidden Face-Trapper in the "Adobe Acrobat" chapter.
Kill a bunny in midair while diving and holding 2 weapons.
Save a hostage.
Decapitate The Dire Bunny.
Find the hidden magnums in the "House of Cards" chapter.
Score a perfect 10 in death.
Find the hidden greasegun in the "Prologue" chapter.
Walk Outside!