Here is the full list of all 49 Atelier Ryza: Ever Darkness the Secret Hideout achievements.
Earned all trophies.
Activated everyone's Fatal Drive.
Became a Braver.
Created a bottle with Gathering Synthesizer Level 51.
Created an item with Item Level 99.
Got Ryza's alchemy level to 99.
Obtained all recipes.
Obtained the Revelation Book.
Defeated the Queen of Shadows.
Completed requests to get Peter to interview you.
Got Ryza's battle level to 50.
Defeated all 5 Great Elements.
Wrote a record of every exploration.
Defeated the King of Storms.
Defeated the Eternal Sculpture.
Defeated the Mirage Master.
Defeated the Savage Assassin.
Defeated the Noble Paladin.
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.
Found all treasure chests.
Visited the Holy Tower of Pynnor and learn the truth.
Created the Bomb Rod.
Helped create Rasen Pudding.
Saved the goat you met on your travels.
Installed the Multiplicauldron at the secret hideout.
Defeated the Shining Puni.
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.
Created the Bug Net.
Installed a Power Reactor at the secret hideout.
Defeated the dragon at the old castle.
Created the Hammer.
Found one treasure chest.
Wrote a record of one exploration.
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.