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