You need to use five different gadgets in a combo to get the “One of Each” achievement. If the multiplier vanishes during the combo, it won’t count. Use the Batclaw Slam (LT + Y, X), the Explosive Gel (LT + X), the Concussion Detonator (LT+B), the Glue Grenade (RT twice), and the Batarang (LT).
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