It is possible, yes. But you would lose a lot of other stats if you tried to reach it.
You basically need:
- Armor set with +Dex
- Class with Passive Crit. Chance
- SA Focus on weapon
- Tattoo of Bravery
- Full buffs
Also finally, Hero Weapons provide higher Critical Chance, and there is a Hero Buff which gives +50% Critical.
So definitely possible to have 100% Crit Rate, but a lot of work 🙂