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