Aliens Colonial Marines
60 Achievements
1,250
35-40h
I Can Handle Myself
Purchase all Upgrades for a weapon
40
How to unlock the I Can Handle Myself achievement in Aliens Colonial Marines - Definitive Guide
Armat A7 Sound Suppressor
Armat Laser Targeting System
A27 High Velocity Rounds
You may need to change the weapon skin to anything other than the default skin.
Note: You DO NOT need to have all four weapon skins unlocked to get this achievement.
EDIT: After doing some checking, it seems that all of the pistol upgrades are related to leveling up and/or completing missions. Completing challenges is not necessary for this one. Also, it seems that the weapon skins do not affect this achievement, and you can unlock the achievement regardless of weapon skin.
If you do this with the Service Pistol, you will also unlock this achievement:
The earliest you can unlock this achievement is when you reach level 18 for your marine. Upgrading the combat pistol is probably is the easiest weapon to get this with. It has 3 upgrades needed for the achievement (skins don't count) and all of them are unlocked before any other weapon. From your menu, press on "versus" then, under the word "customization", highlight and press on "edit loadouts", "marine loadouts". Press to customize when you've highlighted the weapon bringing up your upgrade screen. You'll be able to select upgrades you've unlocked so far and spend points (located in your upper right hand screen) to purchase them. You need to purchase the attachment, sight, and fire mode for the combat pistol to unlock this.
Similar to Field Modified, Kill Certified only this time you will need to purchase every single available upgrade in the Alternate Fire, Attachment, Sight and Fire Mode categories. You do not need to have every single skin unlocked, nor do you need to "buy" them all for this trophy.
For advancing in rank and completing certain challenges, you will receive 1 modification point, which you can spend on improving any of the available weapons.
In order to get this trophy, you will need to purchase all modifications for one specific weapon. The pistol requires the least investment, but the last modification for it is unlocked upon reaching rank 24.