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