Here is the full list of all 17 cloudphobia achievements.
Defeat any stage on normal mode with the Vibroblade
Defeat any stage on any difficulty without the Mothership getting hit
Clear any level on any difficulty without getting hit
Defeat Red Manta Ray 10 times
Defeat Stage #3 under 40 seconds
Defeat Stage #2 under 20 seconds
Defeat Stage #1 under 40 seconds
Destroy all of the missiles during the Stage 3 attack sequence
Earn 100 hits on 1 stage
Defeat the final boss in the last 10 seconds of the stage
Defeat the entire game without dying
Earn 300 hits on 1 stage
Defeat the game without using missiles
Defeat Stage #4 under 40 seconds
Defeat Stage #5 under 40 seconds
Defeat Stage #5 on Hard Mode
Defeat every stage using the Vibroblade