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.
Defeated the Queen of Shadows.
Defeated all 5 Great Elements.
Saw everyone move on to chase their dreams.
Created the Crimson Stone and saved Kurken Island.
Became a Braver.
Created an item with Item Level 99.
Got Ryza's alchemy level to 99.
Obtained all recipes.
Wrote a record of every exploration.
Got Ryza's battle level to 50.
Defeated the Queen of Darkness.
Activated everyone's Fatal Drive.
Entered the Kurken Bunker.
Obtained the Revelation Book.
Completed requests to get Peter to interview you.
Found and installed all Power Reactors.
Found all treasure chests.
Visited the Holy Tower of Pynnor and learn the truth.
Defeated the Noble Paladin.
Created the Bomb Rod.
Defeated the Mirage Master.
Installed the Multiplicauldron at the secret hideout.
Defeated the Eternal Sculpture.
Defeated the King of Storms.
Defeated the Savage Assassin.
Saved the goat you met on your travels.
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.
Created the Hammer.
Created the Bug Net.
Installed a Power Reactor at the secret hideout.
Defeated the dragon at the old castle.
Created the Fishing Rod.
Found one treasure chest.
Wrote a record of one exploration.
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.