Here is the full list of all 27 Shieldmaiden: Remix Edition achievements.
Complete Escape from the Dome
Complete Dome of the Cataclysm
Complete Mt. Runa - The Edge of the Dome
Find the Police Cap
Kill 5 enemies in a single Special Atack
Complete Mt. Runa - Hospital
Find the Frame
Find the Stuffed Bear
Complete Downtown - Scrapyard District
Find the Microphone
Find the Glasses
Complete Downtown - Commercial District
Find the Poster
Find the Telescope
Complete Warden's Sanctuary - Historical Area
Find the Book
Find the Ribbon
Complete Warden's Sanctuary - Promenade
Find the Newspaper
Find the Sprout
Pet the dog
Complete Modigard Main Terminal
Make de Shield hover around Asta for 10 seconds
Defend from a projectile during the wall slide
Kill the Passing Onslaught (the flying enemy inside the Cataclism)
Don't let the Wardenash create a lotus on the ground
Find the Globe