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