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 500 chompys
Made it through 'Pig Weapon' with one set of gloves.
Found the funny face mask.
Made it through the discotheque.
Killed more chompys than your friend in a game.
Killed all the soldier bots in Cross Fire
Made it through Bomb Hats without collecting all the clocks.
Made it through The Grind without getting the weapons.
Got killed by a mine when not wearing the goggles in Helpful Chums
Killed 3 chompys at once with potato bombs
Complete all the challenges
Killed 100 chompys
Spent some turnips.
Made it to the end of game party
Escaped The Grinder
Played as another character.
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
Carried the pig 1000 metres
Escaped The Extreme Grinder
Unlocked Franky in Attack Of The Vegtabots