For this Achievement you’ll need to beat All missions with 90% of all second Objectives complete and as close to Par time as you Can. I recommend Playing through on Easy first then selecting each mission and playing them until you know the layout of every thing. Try avoiding losing Units too as this effects your score.

Best done on Easy.

Gold Medal Score/ and Par Times:

Mission 01: 27000+ 5-12min
Mission 02: 70000+ 15-30min
Mission 03: 45000+ 8-18min
Mission 04: 50000+ 21-23min
Mission 05: 40000+ 21-23min
Mission 06: 45000+ 15-30min
Mission 07: 32000+ 12-24min
Mission 08: 30000+ 18-30min
Mission 09: 35000+ 18-30min
Mission 10: 55000+ 23-32min
Mission 11: 30000+ 23-30min
Mission 12: 32000+ 10-20min
Mission 13: 40000+ 20-60min
Mission 14: 30000+ 15-30min
Mission 15: 30000+ 20-33min