Here is the full list of all 25 Giana Sisters: Twisted Dreams achievements.
Complete the game in Über Hardcore Mode
Complete the second world in Über Hardcore Mode
Complete the first world in Über Hardcore Mode
Unlock Über Hardcore Mode
Obtain a trophy in all Time Attack levels
Obtain a trophy in all Score Attack levels
Collect all gems in the game
Obtain five stars in all levels
Defeat Gurglewocky
Defeat Octor Freud
Use a spiky box like a trampoline
Unlock Hardcore Mode
Defeat Hansel and Gretel
Have a human win a race against bots in three different Dream Rush levels
Unlock Cosmonaut Comrade from the SpeedRunners game by completing a race in three different Dream Rush levels
Have a human win a race against bots in two different Dream Rush levels
Have a human win a race against bots in a Dream Rush level
Complete a Dream Rush race
Avoid spikes by ducking
Bounce off a falling turtle
Jump or dash onto three owls without touching the ground
Land on an owl while twirling
Collect a red gem while twirling
Collect a yellow gem while dashing
Unlock the power to warp your dreams