I don't know if this is the best way to do this but you could create smart lists for each link you want to track. To do this, I would use the trigger "CLICKS link in email," select the email and then use a constraint to specify the link. If you want to retroactively see who has clicked which links, you can still use smart lists but don't use a trigger, use the filter "CLICKED link in email" and add the same constraint.