Here is the full list of all 52 Impossible Challenge achievements.
Complete Tutorial
Complete Episode I
Complete Impossible Challenge I
Complete Episode II
Complete Impossible Challenge II
Complete Episode III
Complete Impossible Challenge III
Die 10 Times
Die 100 Times
Die 1000 Times
Die 10000 Times
Die 10 Times In A Level
Die 50 Times In A Level
Die 100 Times In A Level
Die 500 Times In A Level
Die 1000 Times In A Level
Fall 10 Times
Fall 50 Times
Fall 100 Times
Fall 500 Times
Fall 1000 Times
Make 1000 Score in Endless Mode
Make 5000 Score in Endless Mode
Make 10.000 Score in Endless Mode
Make 50.000 Score in Endless Mode
Make 100.000 Score in Endless Mode
Collect 10 Orbs
Collect 50 Orbs
Collect 100 Orbs
Collect 500 Orbs
Collect 1000 Orbs
Collect 10.000 SP
Collect 100.000 SP
Collect 1.000.000 SP
Collect 10.000.000 SP
Spend 10.000 SP
Spend 100.000 SP
Spend 1.000.000 SP
Spend 10.000.000 SP
Collect All Common Ships
Collect All Rare Ships
Collect All Epic Ships
Collect All Ships
Open Loser Mode
Die Using To Much Brake First Time
Die Using To Much Brake 10 Times
Die Using To Much Brake 25 Times
Die Using To Much Brake 50 Times
Die When Highspeed
Die 10 Times When Highspeed
Die 25 Times When Highspeed
Die 50 Times When Highspeed