For first timers use ME3 Mod Manager. All mods are from Nexus. When modding you need to install the Community Patches for each game _before _any other mods, and install the ALOT texture mod last for each game.
Launcher:
Unofficial LE2 Patch Launcher Video Fix.
Also used a patch to skip online authentication. Found by using a search engine, look in forum posts for the link.
ME1:
LE1 Community Patch.
Black Market License.
Charted Worlds.
Elements of Comparative Weaponry.
Galaxy Map Trackers.
LE1 Streamlined Weapon Loadouts.
Mission Timings.
Pinnacle Station DLC.
ALOT LE1.
ME2:
Unofficial LE2 Patch.
DLC Timings.
EGM Armors for LE2.
Expanded Shepard Armory (ESA) LE2.
Miranda Butt Shot Restoration LE2.
Overlord Morality Fix.
Reaper Husks Consistency.
ALOT Update LE2.
ME3:
Community Framework 1.6.9.
Community Patch.
Choose Your Outfit.
Collectors Cabin.
Expanded Universe Mod.
-EGM Armors.
-EGM Extras.
-EGM Squad.
-EGM Mod Menu.
Miranda Butt Shot Restoration LE3.
Miranda Mod LE3.
Persistent Settings.
Spectre Expansion Mod.
Take Earth Back.
Will using mods stop you from getting achievements? Still got few to get.
You can still get achievements.
I don’t think they disable them, no.