You go into the objective editor..This is found under the scenerio buttton..
http://wiki.heavengames.com/age/Scenario_Menu
You add an objective by clicking on insert..Then you simply type into the type box what you want to say..Be carefull..Don't use any symbols..This one is a killer..".
http://wiki.heavengames.com/age/Objectives_%28function%29
You have to keep a constant order going with your objectives and with your triggers..
I'll try to give you an example.
Lets say you have 3 objectives.
Trigger wise you illustrate.
Trigger1
Active:
Condition : Player controls socket (ply1)
Effect: Objective discover (obj1)
Effect : Objective show (Obj.1)
Effect : Objective hide (Obj.2)
Effect Objective hide (Obj.3)
Result.. Objective 1 will just come up on your screen as the objectives button flashes..When you click on obj. button ..All you'll see is obj.1.. When player1 controls the designed socket
Trigger 2
Active:
Condition : Player controls socket (1st socket) plyr1
Condition : player controls socket (2nd socket) plyr1
Effect objective discover (obj.2)
Effect objective completed (obj,1)
Objective Hide (obj3)
Result..When player1 controls 2 sockets designed..The second objective shows on screen as the objective button flashes..When you click on objective button..The second objective shows with a slide button..when you slide it down.. You'll see the 1st obj completed
Trigger 3
Active:
Condition : player controls socket 1st : player1
Condition: player controls socket 2nd : player1
condition : player controls socket 3rd : player1
Effect : Objective discover (Obj.3)
Effect : Objective completed (obj1)
Effect : Objective completed (obj2)
Results here are..Objective 3 will show on screen..As Objectives button flashes..When you click on objectives button.. You will see obj.3 and a slide..When you slide it down..you will see the first and second objectives showing completed..When the three sockets are controlled by plyr.1
Experiment with it.
Hope this helps out!
Regards