There are many special achievements in "Assassin's Creed: Visions". Whoever falls asleep first loses. This achievement is one of them. To do this achievement, you need to steal a guard who is affected by the blow dart and find a guard with a blowgun. The guard with the key can complete it.
Whoever falls asleep first in Assassin's Creed Vision loses and what to do
Whoever falls asleep first loses
The achievement requirement is to steal a guard affected by a blow dart
Just find a guard with a key on his body to complete it (the minions of the cult who have fragments on their bodies are also enemies in nature, so they can do it). Ordinary people hiding cultural relics do not count. Obviously, looking at the entire map, although there are many guards that meet this condition, they are still limited, so it is best to complete it as early as possible