Here is the full list of all 16 Strike Suit Infinity achievements.
Achieve a multiplier of x9
Destroy a cruiser
Destroy a carrier
Complete 3 rounds in a row without switching into Strike mode
Destroy a frigate
Destroy a shuttle
Max out pilot upgrades
Max out all fighter craft for a round
Max out all reinforcement options
Destroy 7 enemies with the Strike Suits circus missiles in one barrage!
Complete an entire round without shooting
Fly alone for 4 rounds
Don’t let any shuttles escape for 5 rounds
Have 50,000 or more reinforcement credits in the bank
Unlock every single weapon, missile and player upgrade
Don’t let any capital ships escape for 10 rounds