Required for Platinum → counts toward the bar
conseilHelpful but not mandatory → doesn't count
110 trophies in total: 65 in the base game and 45 spread across 16 add-on content packs (Platinum included in the base-game count).
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Nothing is missable: the save stays in free roam after the main story ends, all content remains accessible.
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The Knightfall Protocol ("Knightfall" trophy, id 33) is NOT a point of no return: it can be triggered early for a partial ending, then triggered again after 100% for the full ending.
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The Riddler system (243 challenges spread across 6 zones, capstone trophy "Riddle Me That") is by far the biggest chunk of the Platinum, estimated at 15-20+ hours on its own.
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Only one trophy requires a second playthrough: "The Long Halloween" (id 54) requires replaying Wayne vs Scarecrow in New Story+ on Knightmare.
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On Steam, 108 of the 109 non-Platinum trophies have a direct matching achievement. The only one without a match: "Dark Victory" (Scarecrow Nightmare Missions DLC).
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I AM the Batman! (Platinum) — Reclaim your city.