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