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