Open Corrupted and Rare Strongboxes (0/90). Tamper-Proof(atlas passive): Strongboxes in your Maps are Corrupted, Strongboxes in your Maps are at least Rare.
Open a Unique Strongbox. Oba's Cursed Trove(map): The final area contains no monsters and instead contains five Strongboxes: Two rare Ornate Strongboxes + A unique Jeweller's Strongbox + A unique Arcanist's Strongbox + A unique Gemcutter's Strongbox.
Open at least 18 Strongboxes in a single Tier 16 Map. Winged Ambush Scarab: Area contains 9 extra Strongboxes. Concealed Logistics(atlas passive): Maps from Strongboxes in your Maps are Duplicated. 2 x 9 = 18.