Trash Compactor
Ultra rare0.2%GrindOptionalAnywhere
Research 50% of all items in Journey Mode.
Journey Mode only: research (sacrifice) enough duplicates to unlock half of all item types. Duplicates-to-research counts vary per item, so the road there is dumping everything you loot into research as you play - chests, drops, crafted spares, the lot. A Journey character who plays the game to the endgame while researching habitually crosses 50% naturally; block/furniture stacks are cheap wins for the last stretch.