Here is the full list of all 47 Titan Attacks achievements.
100 aliens escape capture
Destroyed 100 saucers
Used 25 smartbombs
50 aliens escape capture
Captured 100 live aliens
Everything maxed out
Perfect Challenge Level 98
Guns and addons maxed
Perfect Challenge Level 77
Perfect Challenge Level 91
Perfect Challenge Level 84
Perfect Challenge Level 70
Maxed gun power
Perfect Challenge Level 63
Perfect Challenge Level 49
Perfect Challenge Level 42
Perfect Challenge Level 35
Captured 50 live aliens
Perfect Challenge Level 21
Perfect Challenge Level 14
Perfect Challenge Level 28
Perfect Challenge Level 7
Captured 25 live aliens
Upgraded addons to maximum rate
Maxed gun bullets
Captured 10 live aliens
25 aliens escape capture
Completed the Titan levels
10 aliens escape capture
Completed the Saturn levels
Killed 100 parachuting aliens
Added all addons to ship
Destroyed 50 saucers
Completed the Mars levels
Perfect Challenge Level 56
Killed 50 parachuting aliens
Got 100 skill shots
Completed the Moon levels
Destroyed 25 saucers
Got 50 skill shots
Killed 25 parachuting aliens
Completed the Earth Levels
Got 25 skill shots
Killed 10 parachuting aliens
Got the x9 multiplier
Destroyed 10 saucers
Got 10 skill shots