All unlockable champions in Teamfight Tactics Set 16: Lore and Legends
via polygon.com
Short excerpt below. Read at the original source.
The main mechanic for Teamfight TacticsSet 16 is Unlocks. As Lore and Legends boasts the biggest roster yet with 100 total champions, it would be pretty hard to find the unit you’re looking for if all 100 were available in the shop, so 40 champions have been locked behind specific objectives.