If you register for Uplay at the 'Main' menu you can earn Uplay points by completing the following tasks.

10 Uplay Points:
Get the 'Mystery Guest' Achievement by completing Sequence 2.

20 Uplay Points:
Get the 'Tea Is For Englishmen' Achievement by completing Sequence 6.

30 Uplay Points:
Get 'The Sum Of Truth' Achievement by completing Sequence 12.

40 Uplay Points:
Get the 'Abstergo Entertainment' Achievement by reaching Level 20 in Multiplayer mode.