More backtracking chests!
#20 requires the Thief's Key and the Heat element, while #21 just requires the Heat element. Both of these can be found in the Temple Mine.
#22 and #23 are both involved in a tier two Bergen faction quest, which I grabbed at the start. (Technically, #22 has nothing to do with the quest, but you can't get into the cave where it is without the quest...) Standard requirements for unlocking a tier two quest (complete the tier one quest from the same perso, and advance through the game, finishing the Temple Mine in this case).
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