Here is the full list of all 38 Pitfall Planet achievements.
Throw your friend off within 10 seconds of starting a level.
You've bought all the hats!
Find Kate's launchpad and her final diary entry.
Complete every level in Pitfall Planet.
Collect every gem in Pitfall Planet.
Complete the Mountain Core.
Collect all the gems in the Mountain Core.
Complete the game while always getting both players into the elevator.
Beat the race challenge in 30 seconds.
Collect all the gems in the Dead Desert.
Complete the Dead Desert.
Find the secret arcade.
Complete the Rose Caverns.
Collect all the gems in the Rose Caverns.
Complete the Old Watchtower.
Collect all the gems in the Old Watchtower.
Reunite all the missing astrobots.
Complete the Dead Caverns.
Collect all the gems in the Dead Caverns.
Complete the Factory.
Collect all the gems in the Factory.
Find the hidden gem cave.
Complete the Mountainside.
Collect all the gems in the Mountainside.
Complete Greenwood Falls.
Collect all the gems in Greenwood Falls.
Complete Sewage Treatment.
Collect all the gems in Sewage Treatment.
Find the frozen miner.
Buy 5 hats.
Buy your first hat.
Complete the Outpost.
Collect all the gems in the Outpost.
Complete the Chimney.
Collect all the gems in the Chimney.
Complete the Tutorial Caves.
Collect all the gems in the Tutorial Caves.
Seriously, what's up with that?