Here is the full list of all 51 Giana Sisters 2D achievements.
Use the chewing gum.
Get rid of a jellyfish
Wipe out an eye.
Survive the first level
Collect 100 diamonds.
Collect 1,000 diamonds.
Get rid of 50 monsters.
End the first island.
Transform yourself into the Punk Giana.
Get rid of an opponent with a shot.
Get rid of an opponent with one jump.
Get rid of two opponents by jumping without touching the ground between jumps.
Destroy 50 stone blocks.
Get rid of one owl.
Bring down a killer owl.
Get rid of a bee.
Flatten a beetle.
Collect 5,000 diamonds.
Collect 10,000 diamonds.
Collect 50,000 diamonds.
Collect 100,000 diamonds.
Collect 1,000,000 diamonds.
Unlock a bonus level.
Activate all bonus levels.
Finish the classic levels.
Defeat 200 monsters.
Get rid of 500 monsters.
Get rid of 1,000 monsters.
Get rid of 10,000 monsters.
End the 2nd island.
End the 3rd island.
End the 4th island
End the 5th island
End the 6th island.
End the 7th island
End the 8th island.
End the 9th island.
Play the game completely.
Complete the game without a game over.
Bring down a boss.
Jump in the air 5,000 times.
Use the soda bottle.
Get rid of three opponents by jumping without touching the ground between jumps.
Get rid of 10 opponents by jumping without touching the ground between jumps.
Destroy 1,000 stone blocks.
Destroy 5,000 stone blocks
Destroy 10,000 stone blocks.
Destroy 100,000 stone blocks.
Bring down a killer bee.
Wipe out a killer eye.
Get rid of every monster at least once.