The damage modifiers for each difficulty are:
Bronze: 1.75x
Silver: 2.66x
Gold: 3.5x
Platinum: 4.2x
All the numbers can be found here:
https://docs.google....Z3c&output=html
While the game does have a time between bursts that the enemies are supposed to obey, some units decided they didn't like that, such as the Geth Rocket Trooper.
The Nemesis also has 2 attacks. The red laser of doom that has a charge up time, as well as being able to just hipfire her Raptor.
As of right now, I haven't been able to find values for enemy abilities such as the Banshee's Warp, or anything about the damage of melee. Once somebody is able to figure it out, I'll add those to the sheet. I imagine this is something that Bioware will have to tell me about since I'm fairly certain that it's not in the Coalesced.bin file.
Update: Added in damage values for grenades. It's currently unknown if the damage modifier affects force as well. It's possible higher difficulties have a higher force, which would give it additional damage.
Update: Added Platinum damage values.
Update: Added Collector values and made fixes to the damage formula based on in-game tests. Dragoons and Geth Bombers need further testing and should be added this weekend. While testing, I will also be looking into melee damage values as well.
Edited by Cyonan, 03 November 2012 - 01:08 AM.