Here is the full list of all 13 Pan-Pan achievements.
Beat the game.
Find the old crashed ship.
Visit most of the places in the world.
Smack a lot of stuff with the stick.
Hello world. Greet all creatures.
Let the stick do the talking. Smack all creatures with the stick.
Steal an egg.
Collect 100 fuel seeds.
Travel 10000 meter in the world.
Collect 10 fuel seeds.
Collect 1 fuel seed.
Deliver a piece to the broken ship.
Find the battery part needed to fix your broken ship.