Gears of War
50 Achievements
1,000
It's a Massacre
Kill an enemy with the Chainsaw in 100 multiplayer (Player or Ranked) matches of 3+ rounds
10
How to unlock the It's a Massacre achievement in Gears of War - Definitive Guide
As every player is equipped with a Lancer at the start of each round, this can be done on any map. To get a chainsaw kill, approach an enemy (standing or downed), and hit "B" to rev up the chainsaw blade. If you successfully lock on to the enemy, you will perform a vicious slice through the enemy's torso.
However, be careful when performing this kill, becuase if you get shot whilst revving the chainsaw, you will be momentarily stunned, preventing you from moving and thus making you very vunerable to the enemy.
Make sure you are suicide boosting on the War Machine map.
Before the session starts, ask to be one of the people who gets grenade tagged. After you are tagged, use your chainsaw.
Keep in mind that if you are the last 2 people alive when tagged, using the chainsaw typically guarantees that you will win the round. Adjust accordingly.
If it doesn't unlock after exactly 100 kills, so what? you've got 10,000+ chances to get it right.
This method will save you a weapons boosting session and anyone who has boosted Seriously knows that every hour counts!
I think what's going on is that sometimes, for whatever reason, the progress you make in the last match of a session isn't added to the various achievement counters. I first noticed this when boosting the 'Win 20 matches on map X' achievements - if I won 20 matches in one session the achievement would pop, but if I spread them out across multiple sessions I'd have to play 21, 22, sometimes 23 matches depending on how many sessions it took.
Of course, it's possible I've just been really, really lucky - there's no way I can prove this works. If people start trying this and it doesn't work out let me know and I'll take this solution down.
You start every match with a Lancer, which has a chainsaw bayonet. Hitting the melee button will rev the chainsaw. If you can get up to an enemy with a fully-revved chainsaw, you will saw him in half. Do not chainsaw downed enemies or they will count as an execution kill. Kill 100 enemies total in ranked matches with this method to get the achievement.
For more information, see "Seriously...".
You start every match with a Lancer, which has a chainsaw bayonet. Hitting the melee button will rev the chainsaw. If you can get up to an enemy with a fully-revved chainsaw, you will saw him in half. Do no chainsaw downed enemies or they will count as an execution kill. Kill 100 enemies total in ranked matches with this method to get the achievement.
For more information, see "Seriously ..."