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