The “Upd” part stands for Unrestricted Placement Dynamics , but honestly, the community just calls it “the update that finally lets us clip without shame.”

: Aim a firework toy at the character and light it. To earn the achievement, the rocket must penetrate from the outside while lit. What's New in the Recent Updates?

: After several repetitions, the beads will "pop" and respawn, eventually triggering a teleportation event that "clips" the player out of the standard map and into the Backrooms biome, instantly granting the achievement Alternative Strategy