The Caltrain MP36PH-3C 'Baby Bullet' Add-on for Train Sim World 2 has 5 achievements worth 50 gamerscore.
Complete the MP36PH scenario Bay Area Breakdown
Complete the MP36PH Baby Bullet Introduction
Complete 15 services using the MP36PH
Reach Loco Level 10 in the MP36PH
Operate the MP36PH for 360 miles