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