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