Crysis

All objectives are easy to locate and can be done while playing through the story. Secondary objectives are only at Act I and II.

There are 10 secondary objectives.

List of secondary objectives:

-Contact- (2 objectives)
1. Disable the GPS Jamming Device.
2. Investigate North Korean Command Post.

-Recovery- (1 objective)
1. Access the Tactical Network.

-Relic- (1 objective)
1. Disable North Korean GPS jamming station.

-Assault- (1 objective)
1. Gather Intel from KPA

-Onslaught- (4 objectives)
1. Destroy the boxcar.
2. Destroy the Anti Aircraft Artillery (there are 3 of them)
3. Call an Airstrike for the munition dump. (avaiable after you destroyed the 3 AAA's)
4. Pick up the Gauss Rifle (after you destroyed the munition dump)

-Awakening- (1 objective)
1. Infiltrate office and retrieve intelligence data.

Please give feedback if I should do something better or if I missed one.

Secondary Objectives are the yellow targets on your map. They mostly consist of gathering Intel (pressing X near a Laptop-Box) or blowing up certain vehicles or turrets.

If you did every Secondary Objective from the beginning you will get this achievement on Onslaught for destroying all the Anti-Air-Guns, if not sooner.