its on the mission The Belgian Problem its the one where you can either save or blow up the building you could save befor the mission & do both or if not you will have to start again & play up to that point ....... hope this helps
lol can't be bothered tbh, I rented it on Friday, got 940 gamer score out of it - that'll do me for now, great game though, will be sad to see it go, will look out for a price drop, I knew I should have baught it from Gamestation for £19.99 before Christmas
You actually can get both achievements in one playthrough. During the Belgian Problem, BEFORE you pick either to keep or destroy the Morning Star base, save your game then make your choice. After the achievement pops, reload that savefile and pick the other
choice. Then, you'll have both achievements without having to replay the game.