MxSvnty4475,556 Locked 09 Apr 2010 04 Jun 2016
With the difficulty as "time trial," you have to complete the levels: Natla's Mines, The Great Pyramid, and Final Conflict to unlock this achievement.
While playing, you can save time by:
-In Natla's Mines, use the "all weapons" cheat (unlocked by finishing the Greece time trials). So, at the beginning of the level, you can go directly to the control room where you have to shoot through the glass and get the red fuse to ride the drilling machine. So, you are basically skipping finding the other two fuses.
-In The Great Pyramid, use the SMG's when dealing with the huge flying bats when you are ascending the big circular shaft.
Below are great videos by gunj17 and GJ_Chess to help you complete the Lost Island time trials.