-Estimated achievement difficulty: 5/10
-Offline: 12/12 (200)
-Approximate amount of time to 200: 10-15 Hours
-Minimum number of playthroughs needed: 2 (1 for collectibles and score goals, 1 for beating time goals) Specific levels may require multiple playthroughs.
-Number of missable achievements: None
-Do cheat codes disable achievements? No Cheats
-Does difficulty affect achievements? No
-Glitchy achievements: None
-Unobtainable achievements: None
-Extra equipment needed? A second controller. (Online co-op will nullify this if you do it online). This arcade game costs 1200 Microsoft Points.
-Avatar Awards: There are two avatar costumes, 1 for a male avatar and 1 for a female. You get a Lara Croft jungle suit for female avatars, and a mercenary outfit for male avatars.
Lara Croft: Guardian of Light is an arcade game with easy achievements, and fairly simple collectibles. It is a cooperative-based game, but all of the achievements can be done by yourself, including the cooperative achievements. You may have to replay levels while searching for collectibles, as some areas close behind you. Difficulty does not affect achievements, so you can play the entire game on easy.
Step 1: Playthrough 1
I suggest first going through the game trying to collect as many collectibles, and doing as many challenges as you can as you beat the game. This will prepare you for completing time challenges and score challenges, which are much easier with better equipment. You will need to know the layouts of the levels in order to stand a chance on some of the various challenges.
For a guide on all levels to get all collectibles/challenges, go HERE.
Step 2: Score and Time Challenges
In order to gain all of the artifacts, weapons, and relics in the game, you will have to beat every level with the highest score goal(for the weapons), and complete all of the time trials(for relics/artifacts). Those are just on top of the other various challenges within the levels. Others include collecting ten Red Skulls, completing random challenges, doing puzzles in tombs, and finding them in the environment. Once you finish your first playthrough, you should have gained most of the equipment in the game. Now you must replay these levels, several times over depending on how well you do, trying to go for the best times and scores. Using your best equipment, as well as knowing each level will be a must.
Score Challenges: Do not die, or you will lose a lot of points. Get your relic meter high by collecting gems, which you should be collecting whenever you see them, and by not getting hit. Your relic meter reflects the points you gain for each enemy kill, as does the type of enemy you are facing. So kill enemies, but do your best not to get hit. Sometimes it's critical to have you relic meter up when facing numerous enemies in order to get the score needed for the level. A lot of the challenges are very easy, but there are a few tough ones.
Time Challenges: You will want to roll as much as possible. Dying will result in wasted time, because the game will count against you after reloading the checkpoint. Put on artifacts/items that increase your speed, which will help save a few seconds. Avoid as much contact as possible, and try to think outside the box on some cases. What's really the fastest way from point A to point B? Get creative. If you see a grapple ring, many times you can just use your spear to get over something faster.
Step 3: Cooperative Achievements, Finishing Up
The cooperative achievements can all be done by yourself, and even do all of them first before you even start going for all the other achievements in the game. Most of the coop achievements can be done very easily on the first level, by yourself using a second controller if you don't have anyone to play with. The only one you can't get in the first level is Return to Sender, which you must get on the second level shortly after the level starts.
Overall, this is a fairly easy game. The most difficult achievement will be Tomb Raider, since you have to collect all weapons, artifacts, and guns. Also, if there is a second account logged in, they will get all the achievements too, except for Return to Sender. The health and ammo upgrades are not tied to any achievements, but will be very helpful to obtain for the challenges.
[x360a would like to thank Tyger7 for this Road Map]