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