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 500 chompys
Unlocked Franky in Attack Of The Vegtabots
Carried the pig 1000 metres
Made it through 'Pig Weapon' with one set of gloves.
Killed 3 chompys at once with potato bombs
Killed more chompys than your friend in a game.
Got killed by a mine when not wearing the goggles in Helpful Chums
Made it through Bomb Hats without collecting all the clocks.
Made it through the discotheque.
Made it through The Grind without getting the weapons.
Escaped The Extreme Grinder
Found the final piggy.
Complete all the challenges
Did all the challenges in 1 run
Didn't let the Pieosaurus die.
Found the funny face mask.
Killed 100 chompys
Killed all the soldier bots in Cross Fire
Spent some turnips.
Made it to the end of game party
Escaped The Grinder
Played as another character.