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