Here is the full list of all 22 Jets'n'Guns Gold achievements.
Finish one level with Armageddonator.
Finish campaign without being shot down.
Find all secrets.
Find the secret science lab level.
Find Mr. Perfect's secret level.
Kill 60 troops with one hit.
Find and capture all 9 galactic villains.
Find the secret base on lava planet's moon.
Find the secret level with spammers.
Finish game on hard difficulty or higher.
Get to 10th round of the campaign.
Reach score of 100 millions.
Reach score of 10.000 in Tetrix.
Kill 100.000 troops.
Kill 100.000 air targets.
Kill 10.000 ground targets.
Destroy 250.000 targets.
Crack 100 crates open.
Activate 100 devices with RemCon.
Unlock all 12 ships.
Make one hero obtain all medals.
Pick up 100 hitchhikers.