I'm working on the last achievement I need to complete the game, which is Tomb Raider (Collect all relics, artifacts and weapons).
Much easier said than done. You essentially have to beat the high score on every level, meet or beat the record time in a speed run, perform secret objectives, and find every collectible. It's a lot of work for a measly 25 points. I've only got 2 more levels to ace 'til I've earned it; The Mirror's Wake and Xolotl's Stronghold.
I should have it all wrapped up before bed tomorrow :)