Here is the full list of all 23 Space Farmers achievements.
Made it through The Grind without getting the weapons.
Made it to the end of game party
Found the funny face mask.
Killed 100 chompys
Killed 500 chompys
Didn't let the Pieosaurus die.
Got to the end of the game with no deaths.
Made it through the discotheque.
Found the final piggy.
Complete all the challenges
Did all the challenges in 1 run
Played as another character.
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.
Killed all the soldier bots in Cross Fire
Got killed by a mine when not wearing the goggles in Helpful Chums
Killed more chompys than your friend in a game.
Killed 3 chompys at once with potato bombs
Spent some turnips.
Escaped The Grinder
Escaped The Extreme Grinder
Unlocked Franky in Attack Of The Vegtabots