Vampire Survivors
220 Achievements
1,620
50-66.5h
PC
Xbox One
Xbox Series
Empty Tome
Hold 6 different weapons at once.
5
52.71%
How to unlock the Empty Tome achievement in Vampire Survivors - Definitive Guide
Instead of upgrading individual weapons while you level up within a stage, keep picking up different types of weapons and avoid all other upgrades that you are able to choose from.
As the description says, each time you level up or collect a treasure chest, pick a different weapon instead of leveling one up. Once you unlock enough weapons, you'll be using six different weapons in every run.