This page in our guide to Control contains the description of the battle with one of the bosses - The Anchor. By defeating this large opponent, you get an achievement/trophy with the same name as the boss.
Where to find the boss?: During The Enemy Within side mission.
Description: The Anchor is a pretty interesting boss. It has only one attack - it spins around and spits out a lot of clocks. This attack is quite easy to avoid - just go to another platform. The problem here is that the boss is vulnerable only when it opens its mouth.
Therefore, you have to take the risk and stay on the platform that will be attacked by the boss. Keep a clock ready to be shot - use telekinesis to throw an object directly at the boss to damage it.
After two successful attacks, the boss will be joined by flying enemies. Focus on eliminating them quickly. Beware of exploding enemies, because they can take a lot of your health.
You can try to throw an object at the boss as it prepares to attack another platform. Aim at its open mouth, try to throw a clock at the red point. If you succeed, this will speed up the fight. Soon, the battle will be over.