Gears Of War Campaign Achievements

[OmegaTreeFish]

ok well i was wrong before you can do any chapter as long as you have completed the game once. But each chapter has a symbol next to it. For me because i joined in on scene 3 of act 4 i have a gold medel by each one except for scene 1 and 2. If i go back and just do scene 1 and 2 of act 5 on insane i should get the achievment.

Basically as far as i can tell you need to do every scene for that act to get the achievement but you dont need to do them in order. If it doesnt work taht way then i guess its just another glitch to add to the pile.