Not safe to trust a manager to remember all you do. At annual review time I simply scan my email history, and make a list of project contributed to or consulted with. To remind said manager.
Its so easy for the last thing you did to color your manager's view of your performance.
Esp. if your manager is swamped with work. A good manager is practically begging for for good reasons to give you a raise if you're a high performer, but they need the ammo to convince HR/their manager.
Huh, suddenly those review questionnaires asking you to list some of your accomplishments in the past <timeframe> seem a lot less silly - even if they already know you've been killing it all year and have told you as much.
Its so easy for the last thing you did to color your manager's view of your performance.