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