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