Here is the full list of all 22 Etrian Odyssey HD achievements.
Defeated the Wyrm.
Retired an adventurer.
Reached the Sixth Stratum.
Defeated the Etreant.
Obtained more than 250,000 Ental.
Defeated a boss in a single turn.
Reached the Fifth Stratum.
Unlocked the Hexer class.
Dealt 1,000 damage with a single hit.
Completed the quest "The bandit's treasure".
Reached the Fourth Stratum.
Unlocked the Ronin class.
Let an adventurer rest.
Reached the Third Stratum.
Reached the Second Stratum.
Reached the First Stratum.
Obtained all other achievements.
Defeated the boss of the Sixth Stratum on Expert difficulty.
Defeated the Yggdrasil Core.
Defeated an Yggdrasil Bud, Yggdrasil Sprout, and Yggdrasil Clover.
Defeated the Drake.
Defeated the Dragon.