Here is the full list of all 50 11-11 Memories Retold achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Purr with Lotty
Take a photo of the rifle on Kurt's kitchen wall in "The Pursuit", fire the same gun in "Peace"
Go home to Julia
Find all the collectibles
Find all the collectibles from Part III
Collide with 20 ghosts or more
Don't collide with any ghosts
Threaten the soldier three times to learn the truth
Find all missing boys from your village.
Win all card games
As Lotty, comfort the soldier under the tree
Find all the collectibles from Part II
Take a picture of Kurt in "The Collapse"
Get out of the church of Passchendaele
Take all the apples back to Lucie
Cut the gas in Passchendaele
Bring all four wood pieces to the oven
Score with the hidden football in Paris
Catch a rat in the tunnels
Finish Vimy battle without dying
Take a picture of Lotty in Vimy trenches
Find all the collectibles from Part I
Explore Julia's Room
Use all your photographic film in one chapter
Unlock the lone avenger ending
Unlock the forgiven ending
Unlock the revenge ending
Unlock the grudge ending
Unlock the betrayal ending
Unlock the sacrifice ending
See all the credits
Complete Part III
Unlock the peace ending
Choose to go and save Kurt
Listen to Barrett's tearful account of the lives lost under his command
Win at card game against the old ladies in the village.
Give some chocolate to a german soldier
Kick the football in the POW camp
Complete Part II
Help Daniel in Passchendaele
Cut the german communication
Perform all moves in the Dance sequence
Pull the cart of crosses in the cemetery
Find the hidden food stash in the tunnels
Complete Part I
Save Lothar
Do business with Joe
Send two pictures to Julia
Use one of the lifts on Vimy Ridge
Avoid all the mines