ry to not move too far away from the spawn since the relic spawns near it. Get on a fast character with lots of HP points (I recommend Red Death). And when it hit the 18-minute mark quickly sprint to the relic, it will appear on the map on the pause menu and also will be marked as a green arrow on your screen when you're playing. Get to it while you also try to not die and also avoid the cubes at all costs since they are hard to kill. When you get the relic you'll get the achievement once you finish or leave the level.