Here is the full list of all 25 Hero of Not Our Time achievements.
Meet a gang of gnomes.
Inject 100 painkillers per game.
Meet a Mimic.
Create a new type of weapon.
Explore all locations.
Die in tutorial mode.
Complete tutorial mode.
Ride the gruggle.
Fall into the abyss.
Collect 1000 coins per game.
Collect 10,000 coins per game.
Collect 50,000 coins per game.
Inject 500 painkillers per game.
Open all magic scrolls.
Clear the room without raising an alarm.
Find a companion dog.
Find a rainbow cloak.
Kill 100 enemies per game.
Kill 250 enemies per game.
Attach the grenade launcher to the weapon.
Defeat all bosses.
Complete the game with a bad ending.
Complete the game with a good ending, but sacrifice yourself.
Complete the game with a good ending.
Save the game 25 times per game.