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