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.
Make your decision.
Find the Caverns of Fail.
Adjust the horns towards the spheres.
Give all items to Xerxes.
Stone, dust, stone, dust.
Catch the rabbit at the first try.
Give Bryda the wrong astral accumulator.
Tread lightly.
Do you have the guts to start an argument?
Find out who of the adventuring party lies at the first try.
Turn the pig on the grill.
Try to tear down the wall with the golem.
Do You Like Riddles?
Complete Chapter Eight.
Complete Chapter Seven.
Complete Chapter Six.
Complete Chapter Five.
Collect all elementals.
Persuade the spirit of air to help you straight away.
Throw all items into the chasm.
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.
Shards crack loudly.
Does Bryda know who you really are?
Complete Chapter One.