Here is the full list of all 35 The Eternal Castle REMASTERED achievements.
Save the AI
Destroy the Guardian
Crash the ship before reaching the Castle
Grab the Sniper’s GLIDER
Find the shotgun
Find the machine gun
Grab the God’s GLIDER
Find the mace
Find the axe
Find the hammer
Teleport to ship
Grab the Scientist’s GLIDER
Kill the Scientist and his Wife
Find the double barrel shotgun
Find the gun
Use Adam
Use Eve
Grab the Cyclops’ GLIDER
Finish without ever dying
Finish the second run
Finish the third run
Find all available items
Find all GLIDER fragments
End the game at 100%
Reach the Castle with the ship
Kill the Kranker
Make the Kranker happy
Outrun the sniper
Kill the God with your fists
end the intro within 19.87 moments
end game within 300.00 moments
Find the Sword
Find the Grenades
Unplug your friend
Unlock all achievements