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