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