Here is the full list of all 69 Wrack achievements.
Defeat Geizer.
Earn a kill chain of 3x on sentries using the pistol.
Earn a kill chain of 16x or more.
Reset your kill chain timer by gibbing a corpse.
Earn a kill combo of 4x or more.
Increase either your max. health or max. armor.
Earn a kill chain of 4x or more.
Earn a kill combo of 2x or more.
Gib 2 or more monsters in a single kill combo.
Defeat Mechron.
Defeat Gnash.
Defeat Giggordo and rescue Starlyn (episode 1).
Defeat Oculus.
Defeat Galactron.
Earn a gold medal on any level.
Earn a platinum medal on any level.
Earn a tyderium medal on any level.
Earn a gold medal on every level (episode 1).
Earn a platinum medal on every level (episode 1).
Earn a tyderium medal on every level (episode 1).
Complete episode 1 with a score of 5,000,000 or higher.
Complete episode 1 in 60 minutes or less.
Earn a kill chain of 25x or more.
Earn a kill chain of 40x or more.
Earn a kill chain of 69x.
Earn a kill combo of 6x or more.
Earn a kill combo of 8x or more.
Gib 4 or more monsters in a single kill combo.
Gib 6 or more monsters in a single kill combo.
View an item in the gallery.
Complete a map in Time Attack mode.
Share a Wrack creation of yours through Steam Workshop.
Start the game using a code to give you 30 lives.
Increase both your max. health and armor by 50.
Raise both your health and armor to 250.
Complete a level using only the Hyperblade.
Gib 4 or more monsters in a single combo using a toxic barrel.
Have two Arcturans kill each other via infighting.
Poor kitty! :(
Survive a bazooka jump without the Blast Guard.
Survive a bazooka jump with the Blast Guard.
Find a BIG secret!
Kill a kamikaze using the Hyperblade without taking damage.
Obtain a jackpot.
Gib every single enemy on any level.
Complete a map in Score Attack mode.
Complete episode 1 without using a continue.
Complete episode 1 on "Medium" or higher.
Complete episode 1 on "Hardcore" or higher.
Complete episode 1 on "Bullshit!".
Discover the Power Core.
Complete E1L1 with the minimum amount of kills possible.
Watch a replay off of the leaderboard.
Slice up a monster that didn't see you coming!
Kill an idle kamikaze using the crusher's counterattack.
Complete a map you've subscribed to through Steam Workshop.
End a kill chain with a finisher.
End a kill chain with a level 4 finisher.
Kill a monster with the Hyperblade finisher's slash and another with its projectile.
Kill two or more Arcturan soldiers with the pistol's finisher.
Kill a full-health crusher with the shotgun's finisher.
Kill 10 or more monsters with the Pulsar's finisher.
Survive a bazooka jump with the bazooka's level 4 finisher AND the doomsphere.
Beat your previous high score on any map.
Complete episode 1 having killed all of the monsters.
Complete episode 1 having collected all of the treasure.
Complete episode 1 having found all of the secrets.
Kill Geizer with a single shot.
Reset your kill chain timer by gibbing a corpse right before it expires.