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