Here is the full list of all 69 Wrack achievements.
Have two Arcturans kill each other via infighting.
Beat your previous high score on any map.
Defeat Gnash.
Defeat Mechron.
Earn a kill combo of 6x or more.
Gib 6 or more monsters in a single kill combo.
View an item in the gallery.
End a kill chain with a level 4 finisher.
Gib 4 or more monsters in a single kill combo.
Gib 4 or more monsters in a single combo using a toxic barrel.
Gib 2 or more monsters in a single kill combo.
Find a BIG secret!
End a kill chain with a finisher.
Earn a kill chain of 3x on sentries using the pistol.
Defeat Geizer.
Earn a gold medal on any level.
Earn a kill chain of 4x or more.
Earn a kill chain of 16x or more.
Earn a kill combo of 2x or more.
Earn a kill combo of 4x or more.
Increase either your max. health or max. armor.
Reset your kill chain timer by gibbing a corpse.
Defeat Giggordo and rescue Starlyn (episode 1).
Defeat Oculus.
Defeat Galactron.
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 8x or more.
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.
Poor kitty! :(
Survive a bazooka jump without the Blast Guard.
Survive a bazooka jump with the Blast Guard.
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.
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.
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.