Climber Trophy in Assassin's Creed III: Liberation
Climb 8848 meters
How to unlock Climber
Yes, that's the exact height of Mt. Everest. Getting this trophy without grinding is...impossible. You should have around 3KM (3000M) after getting every other trophy so prepare for quite a grind (1-2 hours). You should go and search for a wall that is too high for Aveline and just keep pressing forward. This will reward you with 1.5M per jump and is by far the easiest way to achieve this trophy.
You can always check the Navigation tab under options->stats to check your climbing stats.