Here is the full list of all 31 The Dark Eye: Memoria achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Complete Chapter Eight.
Make your decision.
Complete Chapter Seven.
Complete Chapter Six.
Find the Caverns of Fail.
Complete Chapter Five.
Collect all elementals.
Adjust the horns towards the spheres.
Persuade the spirit of air to help you straight away.
Throw all items into the chasm.
Stone, dust, stone, dust.
Give all items to Xerxes.
Complete Chapter Four.
Ashes to ashes, stone to dust.
Complete Chapter Three.
Find the fox within the labyrinth.
Catch the rabbit at the first try.
Defeat the spider.
The forest is my home.
Complete Chapter Two.
Give Bryda the wrong astral accumulator.
Tread lightly.
Shards crack loudly.
Find out who of the adventuring party lies at the first try.
Do you have the guts to start an argument?
Turn the pig on the grill.
Try to tear down the wall with the golem.
Do You Like Riddles?
Does Bryda know who you really are?
Complete Chapter One.