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