Get all achievements in Garry's Mod :D

Borderlands? Love the game myself, we could even llay together

just finished sonic gen (story) probably do 100% later. fun game (i used PS2 > USB and a PS2 controller ^^)
PS2 controller Xpadder setupand i just noticed there's a config settings in the sonic gen folder in all programs
and the game i should suggest myself is youre never gonna believe this!

POKéMON RUBY/SAPPHIRE/EMERALD

you can just dll an emulator because the batteries are probably dry and original games won't save berry stuff etc. like mine :(
GL HF
even tho pkmn isn't on steam (wich would be weird) it has an awfull lot of actual in game goals (it was GOLD silver but 3rd gen has more stuff to do ^^)

Good luck with Super Meat Boy. You'll need it.

Also, try to get every achievement on Realm of the Mad God :)

100% Skyrim?

Damn

At the moment, Sonic Generations is not possible to 100%. Because Online Mode is broken. (I only left 3 more achievements to 100%, and they are all Online Mode achievements).

Also, to 100% Renegade Ops, you need Cold Strike DLC.

I suggest:

• Borderlands. They have buncha achievements, nice gameplay, and only a handful of those achievements required heavy extra work.
• Anomaly: Warzone Earth. It has nice gameplay, and only 1 or 2 "difficult" achievements.
• Orcs Must Die

This site helps: http://steamscore.net/

Great idea, i've been doing it myself. Maxed out Lucid and almost PvZ.

As for suggested games: Fortix 2, Space Pirates and Zombies, Mount and Blade: Warband, Torchlight
or Counter Strike: Source and Civilization V (lotsa achievements in both)

Do Magicka, because Magicka is awesome!

1. Grab a copy of Persona (any will do)

2. Enjoy not seeing anyone for about a week and a half. That's how long it's gonna take you.

Use a controller for Sonic Generations. It'll be hell playing it with the keyboard.

Defense Grid: The awakening. It's really awesome if you like tower defense :D
Another suggestion is Terraria. The first view looks really stupid, but trust me the game is awesome!

Booster Trooper, for no better reason than because it has a lot of cheese (250, +/- 30), and we can play together ♥

I have 100% Cheese too.

All legit, no cheating.

Revenge of the Titans?

Also, since you didn't specify Steam, World of Warcraft (and/or StarCraft II)!

You can waste a lot of time on Dungeon Defenders!

But for your own safety....stay away from 100% SMB and RotMG!!!

Post on my subreddit...it's so lonely.

Dungeons of Dredmor?

Secrets of the Magic Crystals

Lara Croft and the Guardian of Light, my only 100% I don't see on your list
and Psychonauts is totally worth 100%ing :D

Buy the Indie Royale bundle and finish containment. You should be able to get all achievements in 10 hours or so.