Getting Achievements and Trophies
Many of the achievements/trophies are earned as you progress through the game. For example, as you complete a chapter or get through an area alive, you earn these rewards. Others require you to collect items such as logs, schematics, or semiconductors. However, some require actions out of the ordinary and are easy to miss if you do not know about them or what to do. Here are some tips to help you get those tougher or more obscure achievements/trophies.
Lightspeed De Milo
Within the shopping concourse in Chapter 3, there is a statue of the Lightspeed Boy. Use your plasma cutter to shoot off his arms and head to earn this achievement/trophy. See, that was not so tough
Collect Peng
This little statue is tough to find. You actually have to complete a separate puzzle in the main frame area in Chapter 7 to reach a secret room where this beauty is hiding. Check out the walkthrough for Chapter 7 of the game for a detailed explanation of how to get the Peng.
Killing Necromorphs
Many of the achievements/trophies are awarded for killing Necromorphs. Some are for dismembering limbs or using kinesis to launch objects at enemies. In addition, almost every weapon has a reward that you can earn for using them. Some, like the javelin gun and the line gun, have more than one achievement/trophy for using them. The key to earning these is to get all of the weapons and then use them. If you stick to only four different weapons, you will miss out on several rewards-so experiment with them all. Don't forget to use stasis. Killing enemies while they are in stasis also earns you an achievement/trophy. In addition, you will need stasis to kill the Brute without taking any damage yourself.
Upgrading
Finally, there are a few achievements/trophies that are rewarded for upgrading your items and weapons. Be sure to upgrade your stasis first, and then your RIG. This will give you a reward. Then fully upgrade one of your weapons for another reward. Finally, fully upgrade four weapons and then select them all for your use to get another reward.