Here is the full list of all 16 Space Ripper achievements.
Collect 2000 gears
Upgrade Death Ray
Collect 1000 gears
Upgrade Engine
Destroy Asterobot
Destroy Enemy Station
Destroy Crabotron
Destroy Saw Robot
Get all Death Ray upgrades
Survive during 46 waves
Get all upgrades
Get all Engine Upgrades
Collect 3000 gears
Collect 5000 gears
Collect 7000 gears
Collect 10000 gears