Here is the full list of all 21 Cyberpunk 3776 achievements.
Complete Stage One
Complete Stage Two
Complete Stage Three
Complete Stage Four
Complete Stage Five
Complete Stage Six
Complete Stage Seven
95% Erased Enemies at any Stage and survive
Collect 250 Upgrade Points
Achieve a Multiplier of x250
Achieve a Multiplier of x500
Achieve a 5 Million Highscore
Achieve a 10 Million Highscore
Achieve a 20 Million Highscore
10% or less Health at Stage End
100% Health at Stage End
Achieve a 30 Million Highscore
Read the Pilot's Diary
Reset after completing Stage Three
Beat 25k Enemys
50+ Attempts