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