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