Catan

One of the easiest trophies. Only one thing you have to be careful about and that is that 4 cities gives you 8 victory points. Therefore you can only have two other victory points, so if you pick up to many victory cards or 'Biggest Army' or 'Longest Road' you will get to 10 points and thus end the game before you get 4 cities.

Tips:
-Have good numbers on stone and wheat as these are needed to build cities.
-And remember you only need a total of 4 roads to get 4 cities. So concentrate on upgrading your settlements to cities before anything else.