Use this list of achievements to unlock the corresponding effect:
5pts. Dual Fighter: Form the double ship, discover the Clandestine method
5pts. Enemy Fighter: Shoot down a red captured Fighter
5pts. Stage 10: Get to Stage 10
10pts. Dragonfly: Find the Dragonfly during battle
10pts. Stage 20: Get to Stage 20
15pts. Perfect Bonus: Shoot down all enemies in a Challenging Stage
15pts. Mosquito: Find the Mosquito during battle
15pts. Scorpion: Find the Scorpion during battle
25pts. Stingray: Find the Stingray during battle
30pts. Blue Spaceship: Find the Blue Spaceship during battle
30pts. Galboss: Find the Galboss during battle
30pts. Stage 30: Get to Stage 30