I've provided my
Unlocks Manager here on MTS, and it allows you to unlock/lock achievements, ambitions, and unlocks. However, due to the way the game is programmed, it's not possible to lock achievements without also locking the ambitions that have them defined as requirements. Well, you could, but the next time you load the game, the ambition will be locked and you will not be able to play your save game until the ambition is unlocked again.
But the functionality is explained in more detail in the mod thread.