Here is the full list of all 23 Space Farmers achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Killed more chompys than your friend in a game.
Killed all the soldier bots in Cross Fire
Spent some turnips.
Made it through the discotheque.
Got killed by a mine when not wearing the goggles in Helpful Chums
Complete all the challenges
Made it to the end of game party
Killed 3 chompys at once with potato bombs
Escaped The Grinder
Killed 100 chompys
Played as another character.
Made it through The Grind without getting the weapons.
Found the funny face mask.
Killed 500 chompys
Didn't let the Pieosaurus die.
Got to the end of the game with no deaths.
Found the final piggy.
Did all the challenges in 1 run
Made it through Bomb Hats without collecting all the clocks.
Carried the pig 1000 metres
Made it through 'Pig Weapon' with one set of gloves.
Escaped The Extreme Grinder
Unlocked Franky in Attack Of The Vegtabots