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.
Complete Chapter Five.
Collect all elementals.
Adjust the horns towards the spheres.
Give all items to Xerxes.
Complete Chapter Four.
Ashes to ashes, stone to dust.
Complete Chapter Three.
Defeat the spider.
The forest is my home.
Find the fox within the labyrinth.
Complete Chapter Two.
Give Bryda the wrong astral accumulator.
Shards crack loudly.
Turn the pig on the grill.
Find out who of the adventuring party lies at the first try.
Complete Chapter One.
Do You Like Riddles?
Try to tear down the wall with the golem.
Does Bryda know who you really are?
Do you have the guts to start an argument?
Tread lightly.
Catch the rabbit at the first try.
Stone, dust, stone, dust.
Throw all items into the chasm.
Persuade the spirit of air to help you straight away.
Find the Caverns of Fail.