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