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