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