Battlefield 3

Cuz there is no Videoguide: here is one.

In Operation Swordbreaker, just after you RPGed the Sniper in the Hotel you need to backup your Medics form the Roof. Here you cant die, else you miss this Achievement (thanks to SecretSpyAgent to find that out) - the Descriptions in the Achievement Details is a bit confusing.

Tipp: After you played thorugh the Campain you can replay the Missions via a Mission Selectionmenu. So just play the Mission on easy, if you have trouble.

This achievement is Not On My Watch worth 25G

For this achievement you need to Protect Chaffin from the soldiers on the streets and roof in Operation Swordbreak. Mainly they will be coming from the street level directly infront of Chaffin. There will also be a group of soldiers on the roof to the left of your position. Take these men out while Chaffin advances to save your fallen comrade.

This achievement can be missed, requiring you to replay the mission

*It seems you need to stay behind after defending Chaffin and shoot the remaining enemies running after him. Alt account did pop when I did this.

This achievement is missable and/or bugged. It didn't unlock for me on my first playthrough, which was on Hard. I replayed the level on Easy and it unlocked straight away. (Edit: Though it doesn't say it in the description, a death during the level will prevent you from getting the achievement. Do it all in one go.)

Chaffin is the solder who gets shot shortly after the first time your squad breaks into two groups. You drag him to safety, clear the street and then move up to the roof. Take out the sniper with the AT rocket, and move to the NW corner of the building as directed. Switch to your secondary weapon which has a high-powered scope and prepare to take out enemies on the street.

After taking out a group on the street, a member of your squad says that there are guys on the rooftops, so take them out. The Marines on the street will move up to the next cover and more enemies will spawn on the street and balconies of the second floor of one of the buildings on the left side of the street. Take them out again, and yet more enemies will spawn on the street (one of the squad members says something to the effect of "Oh fuck" at this point).

After that group, the Marines evac Chaffin to safety (you can zoom in and see them carrying him into an alley). As soon as your squad member asks "Can we get off this fucking roof now?" the achievement should unlock.

This was literally the easiest achievement ever.

When you are at the part of defending the ground team, in the mission mentioned above, just sit there and wait behind the walls.

I played the game on easy and saw my team taking out the bad guys on the street. If you do not die, while staying in cover, the achievement will pop.