This thread is all you need for this achievement:http://www.xbox360achievements.org/forum/showthread.php?t=10...
A list of a LOT of terminals (more than enough for the achievement) and their difficulty.
Credit goes to RaidenX49 for the entire guide, but I don't think anyone on this site should have to sit through this achievement without this guide by their side :D
If you science skill isn't high enough to get the majority of these, remember to use the following:
Lab Coat (Obtaining from Vault 106 is the easiest method)
Science bobblehead (See Vault Tech CEO)
Any +science or +INT items.