Here is the full list of all 20 Fated Era achievements.
Beat the game on any difficulty and any size.
Beat the game on any difficulty with the best ending.
Beat every level in the game on any difficulty with a 6x6 or greater world.
Beat the game in under 3 hours.
Deal 200 damage more than the enemy in a single battle.
Attack at least 40 times in a single battle.
Cast magic 10 times in a single battle.
Find 50 secrets on the battlefield.
Beat a new level in less than 5 minutes.
Learn every perk in the game.
Have a unit with one perk from every class.
Rename 15 units.
Recolor 20 units.
Have 12 troops.
Beat the game on futile difficulty.
Beat the game with permadeath.
Build a unit with 4 Deadeye and 4 Agent perks.
Build a unit with 4 Bulwark and 4 Samurai perks.
Build a unit with 4 Merc and 4 Bishop perks.
Build a unit with 4 Magician and 4 Warlock perks.