Here is the full list of all 42 Tecroroid Assault achievements.
Destroy 1000 Enemies
Destroy 5000 Enemies
Destroy 10000 Enemies
Shoot down 20 saucers
Destroy 50 or more enemies without taking a hit 15 times
Destroy 100 or more enemies without taking damage 10 times
Destroy more than 200 enemies without taking a hit
Clear a wave without taking a hit 5 times
Take less than 5 hits before completing a level
Clear 5 levels without taking more than 2 hits
Get an A Rank on Level 1
Get an A rank on level 2
Get an A rank on level 3
Get an A rank on level 4
Get an A rank on level 5
Get an A rank on level 6
Purchase your first upgrade
Complete a level 5 times without upgrading
Collect 10000 energy cores
Collect 50000 energy cores
Shoot down 50 saucers
Shoot down 200 saucers
Got 100 skill shots
Got 500 skill shots
Got 750 skill shots
Got 1000 skill shots
Got 9x multiplier
Clear 20 waves without taking a hit
Clear 40 waves without taking a hit
Clear 60 waves without taking a hit
Got a perfect on special stage 1
Got a perfect on special stage 2
Got a perfect on special stage 3
Got a perfect on special stage 4
Got a perfect on special stage 5
Got a perfect on special stage 6
Got a perfect on special stage 7
Got a perfect on special stage 8
Got a perfect on special stage 9
Got a perfect on special stage 10
Got a perfect on special stage 11
Got a perfect on special stage 12