Full list of all 44 High On Life achievements. It takes around 20-25 hours to unlock all of the achievements in the base game on Windows.
The base game contains 32 achievements, and there is 1 DLC pack containing 12 achievements.
Take Knifey's advice and stab Gene in the gut.
Defeat 9-Torg.
Obtain Knifey.
Juggle an enemy in the air with at least 5 shots.
Kill Slumsley.
Defeat Douglas.
Obtain Sweezy.
Use Sweezy to boss around the Office Moplets.
Defeat Krubis.
Obtain Gus.
Obtain the Jetpack.
Obtain Creature.
Defeat the Skrendel Brothers.
Obtain the Mag-Boots.
Defeat Dr. Giblets.
Pay your bill at Applebee's.
Spend 15 hours at the very real in-game alien strip club.
Defeat Nipulon.
Obtain Lezduit.
Say goodbye to Suit-O.
Sacrifice a Gatlian other than Kenny during the fight against Garmantuous.
Defeat Garmantuous and take down the G3 cartel.
Pop 20 Grunt eyeballs.
Watch Globo's rise to fame.
Discover the movie theater.
Sit through the entirety of the really annoying countdown show on TV.
Discover Dr. Gurgula's hideout in the Human Haven.
Unlock and explore every collectible warp base.
Find and open every Luglox chest.
Unlock every post in the Bounty Hunter forums.
Collect every trading card in the game.
Complete the game with Stan's product in your inventory.