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