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