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It’s important Marion, trust me.

Complete the "Into the Mountains" level in Story Mode.

It’s important Marion, trust me.0
4 guidesOffline Game ModeSingle PlayerCooperativeHost OnlyMain Storyline
12 Feb 2011
11 1 0
Simply progress through story mode until you get to the level "Into the Mountains". It doesn't matter whether you enable cheats in Extras-Menu or not, as soon as you finish the level, you will get the achievement.

Just follow the video guide below, or use the following guide, which will also give you an idea where to find the hidden items in the level:

Credit for the video goes to