Re: Achievement paramour 2
Hey @JordanSleepy25,
Sadly, romancing Liara in Mass Effect 2 did not provide the Paramour achievement in the original release as that option was only available to those who had the DLC.
You can check out this site for more details on the eligible romance options in ME2 and ME2 Legendary Edition.
As you mentioned, romancing someone else in ME2 does cause Liara to be upset in ME3. You're able to work this out and make a decision at that point, though if you're hoping to avoid this the alternative is to avoid the other romance options in ME2.
That does mean if you'd like to stick with Liara for all three games, unfortunately you would need a separate playthrough to get the final Paramour achievement.
The picture on Shepard's desk of your love interest from ME1 would stay there unless you pursue one of the other love interests in ME2, so that part doesn't appear to be bugged. 🙂