Here is the full list of all 13 Attack of the alien thingies from lava! achievements.
Unlock Rifle
Unlock Assault rifle
Unlock Machine gun
Upgraded guns at start *
Upgraded guns at start **
Upgraded guns at start ***
Start from wave 10
Start from wave 20
Start from wave 30
Unlock endless mode
Unlock automatic Pistol
Unlock automatic Revolver
Unlock automatic Rifle