Here is the full list of all 8 Underdone achievements.
You completed the tutorial.
You helped Kleiner with his bird problem.
You watched the introduction video.
You completed the Quick Battle.
You don't care about lore and skipped the introduction video.
You selected the highest field of view setting even though this has no effect.
You enabled Microtransactions in a single player game even though this has no effect.
You downloaded free Unity assets even though this has no effect.