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