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