I found a list here (including negative reputation modifiers):

[url=http://baldursgate.wikia.com/wiki/Reputation#Baldur.27s_Gate_.26_Baldur.27s_Gate:_EE]http://baldursgate.wikia.com/wiki/Reputation#Baldur.27s_Gate_.26_Baldur.27s_Gate:_EE[/url]

Edit: it seems to be missing some quests as well, like giving the angel skin ring to Fergus

I have noticed that Tales of the Sword Coast content has no reputation modifiers in any of the quests.

Based off what I said in the previous post, one way to find all scripted reputation modifiers is to decompile all of the game's scripts and search them for ReputationInc and ReputationSet. (You could also just search for Reputation, but that might also find spots that check your reputation rather than changing it.)

Note that reputation changes that are hard-coded (like the bonus for donating at a temple, I believe) will not be found this way. Also, there's no guarantee that all of the script is actually reachable through normal play.

Yes, but OP didn't ask for a list, he wanted people to give them one by each post. It's quite a nice exercise trying to remember all those quests.

The list is a bit chaotic, but I've found another one that is missing from both:

Location northern part of Baldur's Gate city - kill Petrine's cat, then talk to Bheren. If your reputation is 1-7, you'll get +1 (similar to Cordyr and the sirines).

All quests from TotSC seem to be a little bit vague in terms of whether the outcome is pointing towards "good or evil", so there's no surprise there are no reputation modifiers:
1) Ice Island - killing all the trapped mages is no good deed, however they try to kill you first, so not evil as well (plus the reason why the party is being send there - either blamed for murdering Shandalar's daughters, or his selfish request).
2) Isle of Balduran - again killing most of the inhabitants, but saving the main land from Lycanthropy, very bittersweet ending.
3) Durlag's Tower - cleansing the tower, but cause the demon to be released (defeating the demon is rather correcting the previous mistake).

That's how I see it at least.