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Halo 3: Activate Terminal 2 on The Ark.

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4 guidesOnline/Offline - These achievements can be obtained in either an online or offline game mode.Single Player - These achievements can be obtained by a single player.Cooperative - These achievements can be obtained by two or more players in a cooperative game mode who have met the achievement requirements.Collectable - These achievements are obtained by exploring the game environment to find a set of unique objects.
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14 Nov 2014
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Terminals can be found on ANY difficulty.

The video below is all you need to see to find the terminals on THE ARK. It is very easy to follow.
All credit goes to WikiGameGuides for the video guide.