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