Here is the full list of all 20 VectorWave achievements.
Beat 6 levels
Skip over 3 minutes of time in a single level
Beat a level only using laser based weaponry
Beat a level only using explosive based weaponry
Beat any hard level without the use of Buff Towers or OC Grenades
Beat any level without upgrading a single tower
Beat 12 levels
Beat 18 levels
Have more than 5000 in the bank at one time
Have more than 10000 in the bank at one time
Have more than 15 hours of playtime in VectorWave
Destroy more than 3000 Viruses
Destroy more than 6000 Viruses
Destroy more than 9000 Viruses
Have one of every kind of tower on the field at once
Beat the final level without losing any health
Beat every level at least once without losing any health
Destroy a Zapper before it has the chance to disable any of your towers
Beat your own highscore on any level
Beat any Level without selling a single tower