I lately played assassin's creed 4 and was rewarded with Altair and Ezio's robes but i have only played assassin's creed 3 and assassin's creed 2 so i was wondering if i could play assassin's creed liberation get uplay points and rewards and unlock Connor's robes. Would this work or not please help.
Taken from the Assassin's Creed Wiki:
Awarded to those with an internet connection and three Assassin's Creed games in their Uplay rewards and actions.
Since U-Play is checking that the games are logged in your game library, you will need to log in to U-Play from three separate Assassin's Creed games (and from my interpretation, completed at least one of its 'actions').
If the unlock was specifically earned by spending U-play points, earned through completing the actions, then yes. You could earn the points in an unrelated game. U-play points are not specific to the game, so you are free to earn points in one game, and spend them all in a different title.