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