Here is the full list of all 49 Atelier Ryza: Ever Darkness the Secret Hideout achievements.
Earned all trophies.
Defeated the Queen of Shadows.
Created an item with Item Level 99.
Got Ryza's alchemy level to 99.
Became a Braver.
Obtained all recipes.
Created a bottle with Gathering Synthesizer Level 51.
Activated everyone's Fatal Drive.
Defeated all 5 Great Elements.
Obtained the Revelation Book.
Defeated the Eternal Sculpture.
Completed requests to get Peter to interview you.
Wrote a record of every exploration.
Found all treasure chests.
Saw everyone move on to chase their dreams.
Created the Crimson Stone and saved Kurken Island.
Defeated the Queen of Darkness.
Got Ryza's battle level to 50.
Helped create Rasen Pudding.
Entered the Kurken Bunker.
Saved the goat you met on your travels.
Found and installed all Power Reactors.
Visited the Holy Tower of Pynnor and learn the truth.
Defeated the Noble Paladin.
Defeated the Mirage Master.
Defeated the King of Storms.
Defeated the Shining Puni.
Defeated the Savage Assassin.
Created the Bomb Rod.
Installed the Multiplicauldron at the secret hideout.
Helped Empel regain his former strength.
Spent the night camping in the Underworld.
Laid eyes on the Underworld.
Installed the Gathering Synthesizer at the secret hideout.
Learned about the history of Ryza and the others.
Installed a Power Reactor at the secret hideout.
Defeated the dragon at the old castle.
Created the Bug Net.
Created the Hammer.
Found one treasure chest.
Created the Fishing Rod.
Wrote a record of one exploration.
Built a secret hideout for everyone.
Witnessed the rise of a strange beast.
Attended a tea party with Ryza and Klaudia.
Created the Woodcutter's Axe.
Created the Reaper's Scythe.
Synthesized for the first time.
Visited the mainland for the first time.