Here is the full list of all 42 Survive in Space achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Finish all levels on hard difficulty.
Spend 250 player upgrade points.
Add your own music.
Destroy 500 enemy waves.
Unlock bonuses on all ships.
Finish level 1 on hard difficulty.
Finish all level on medium difficulty.
Destroy 5000 enemy ships.
Kill Emperor.
Finish all levels on easy difficulty.
Spend 50 ability upgrade points.
Kill Eldon.
Spend 100 player upgrade points.
Destroy 100 enemy waves.
Kill Xila.
Unlock all bonuses on single ship.
Play fortress mode.
Play asteroid mode.
Destroy 1000 enemy ships.
Use laser 250 times.
Spend 50 player upgrade points.
Kill Narder.
Destroy 50 enemy waves.
Destroy 500 enemy ships.
Use homing missiles 100 times.
Unlock bonus on single ship.
Use laser 100 times.
Use homing missiles 50 times.
Spend 20 ability upgrade points.
Kill Hazzard.
Use laser 50 times.
Play enemy mode.
Use homing missiles 20 times.
Use laser 20 times.
Destroy 10 enemy waves.
Destroy 100 enemy ships.
Finish level 1 on easy difficulty.
Destroy 50 enemy ships.
Spend ability upgrade point.
Spend player upgrade point.
Finish level 1 on medium difficulty.
Destroy 10 enemy ships.