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