Here is the full list of all 25 Pale Echoes achievements.
Complete the game at least once in Perfection Mode. -- "You... you're not human, are you?"
Read all of the Dev Commentary. -- "Have I become some kind of collectable item, myself?"
Complete the game at least once in Plus Mode. -- "This isn't the end... okay?"
Earn the happy ending. -- "Also, you passed the test, so yay!"
Catch up with old friends. -- "Perhaps life isn't always as predictable as it seems."
Defeat the strongest of foes, proving mastery as a saeren. -- "That makes you pretty much the guardian of the world now."
Read through all of Spinel's helpful tutorials, tips, and tricks. -- "We don't want a repeat of the last time you forgot."
Use Memory Mimicry mode at least once. -- "At least you can control memories competently."
Use Legacy Music mode at least once. -- "It reminds me a lot of my home..."
Complete the game for the first time by purifying the Heartless Echo. -- "... Thank you, my friend."
Collect every recruitable memory. -- "Looks like you're just going to have to make do without me, I'm afraid."
Reach 100% Completion. -- "Perfect knowledge opens the door."
Travel through all of Spinel's windows. -- "I always enjoy coming here."
Collect every lexicon entry. -- "The cat doesn't seem to care."
Discover the dark secret that the quartermaster keeps hidden away. -- "Some things are best left alone."
Talk to every non-recruitable memory. -- "It's a fine day today."
Waste a turn by using four consecutive Geomancy and Link abilities. -- "... This isn't getting us anywhere!"
Purify every area visible on the Overworld Map. -- "This is how a saerii cleans up a mess like this!"
Learn all of Schorl's weapon lore abilities. -- "A bit crude, but undeniably effective."
Complete the Egress Archipelago by purifying the Indignant Echo. -- "Whatever happens, you and I will find a way to fix this."
Infuse all 12 of the class D memories. -- "Well, if we're lucky, we should be able to find some replacements on the other side."
Complete the town of Obelisk by purifying the Forlorn Echo. -- "It's difficult to hate some humans when I see how hard they fought."
Complete the Alcove Memorial Site by purifying the Malicious Echo. -- "Another day, another human mess to clean up."
Deliberately abandon a purification. -- "Remember, you can fail a purification as much as you want without consequence."
Locate a place in the world of memories that even Spinel can't reconstruct. -- "There's... nothing here?"