Assassins Creed 3 -

To achieve 100% completion in Assassin's Creed III , you must synchronize all main memories, fulfill every secondary objective, and complete all side missions on the DNA tracker.

: Most missions have optional objectives (e.g., "stay undetected" or "ledge assassinations") required for 100% synchronization. If you fail one, you can replay the memory later from the DNA tracker. Economic & Progression Tips Assassins Creed 3

: Naval missions are a major new addition. You can upgrade the Aquila (your ship) to make these missions easier. To achieve 100% completion in Assassin's Creed III