super easy way to do this and
with another person. You'll need to be in a lobby with 3 people, the creature, the ghost, and the survivor. Creature spawns an idol near the players, then kills one person (whoever is going for the ghost achievement first). The living player stands near the idol to make it much easier for the creature to find the ghost, and the ghost, obviously, stays near the survivor. Once the creature finds the survivor again, the ghost breaks down the idol, and the creature builds it back up. Both will get to 25 for their respective achievement, then the creature can kill the survivor, and the next person is up.
Make sure to rotate it, so that the same person doesn't place 25 idols as Creature 2 turns, as you'll need to then play an extra turn for nothing.
Comment if you have questions