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