This trophy unlocks when you unlock the other trophies.
This guide will not describe each trophy and how to unlock them, if you are looking for a specific one, check its trophy guide for a detailed guide.
I believe that this is the fastest way to earn all the trophies.
Step 1: Complete the campaign on veteran
Step 2: Complete the campaign on recruit collecting all intel and earning the trophy "Immortal"
Step 3: Completing the rest of the miscellaneous trophies
Completing the campaign on veteran will unlock you:
- Back in the Saddle
- Danger Close
- Cold Shoulder
- Tag 'em and bag 'em
- Royale with Cheese
- Soap on a Rope
- Desperate Times
- Whiskey Hotel
- The Pawn
- Out of the Frying Pan...
- First Day of School
- Black Diamond
- Turistas
- Red Dawn
- Prisoner 627
- Ends Justify the Means
- Homecoming
- Queen takes Rook
- Off the Grid
- For the Record
- The Price of War
Completing the campaign on recruit collecting all the intel and earning the trophy "Immortal" will unlock you:
- The Road Less Traveled
- Leave No Stone Unturned
- Immortal
For some of the miscellaneous trophies, I will also list the best mission to unlock it in.
The rest of the miscellaneous trophies are:
- Pit Boss
- Ghost
- Colonel Sanderson
- Ten plus foot-mobiles, Easily done in Wolverines!
- Unnecessary Roughness, Easily done in The Gulag
- Knock-knock, Easily done in The Only Easy Day... Was Yesterday
- Some Like it Hot, Easily done in Wolverines!
- Two Birds with One Stone, Easily done in Contingency
- Drive By, Easily done in Endgame
- The Harder They Fall, Easily done in Exodus
- Desperado, Practically can be done in any mission except for S.S.D.D and Endgame
- Look Ma Two Hands, Easily done in The Hornet's Nest
- No Rest For the Wary, Easily done in Cliffhanger
- Three-some, Easily done in Team Player
- Target Confirmed
- Angel Savior
- Do NOT push this button
- The Student Surpasses the Master
- The Real Gun Game, Easily done in The Enemy Of My Enemy
- Precognitive Paranoia
- Silent Skies
- Clay-more
- Bird Hunter
- Hot Potato
- Clown in Training
- Headbanger, Easily done in The Hornet's Nest
Remember to check the trophy guides on any if you do not know what to do.