This was terrible game design. But I squeezed some lemonade out of it. I'll explain
Call of Duty Warzone added a new map, "Rebirth Island". It's a new battle royale island, which is great, but it's very, very small. Super small, actually. They even know this because they currently only have about 50 people on it max.
To "celebrate", they added an "event" with about 15 "achievements" so you could win themed watches, patches, the usual. One of them was that achievement, "BRB", which is "Pilot a Vehicle on the Island for 20 Minutes".
Problems are multiple. First - the island is super small - you have to drive in circles around very tight turns. Also: It's a small space so EVERYBODY shoots at you because they HATE you because you're a jerk in a vehicle on a small island. You're just spreading anger.
So it sucks for everybody.