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