Blood Bowl

Start a Goblin Team with all 3 Secret Weapon players (Looney, Fanatic, Pogoer)

Since Secret Weapons are automatically sent off at the end of a drive/half, you'll be over halfway to your target with ease. A couple sent off from fouling and you'll be set to get the achievement.

It actually unlocked for me before the end of the match, as soon as I was in the lead and had 5 sent off. Possible glitch?

I got Survival of the fittest, Cracked skull, Foul play and Veni, vidi, vici ! within one and a half hours.

The trick is that I imported my orc team from campaign (so this does only work with bashy teams, as one might guess anyway).
I had 3 Black Orcs with Block and Mighty Blow, also 4 Blitzers with Tackle and Mighty Blow. They also had some other skills as well as my Linemen had Block and some random skills, but those are the important ones. You should try to get those while going for the campaign achievement.

Then create a goblin team in campaign and add 16 normal goblins. Make sure you don't hire an apothecary for this team. Then save and quit.

Start a one-off match, Blitz mode real-time on easy or medium, and edit the match rules first. Up the time limit to 8 minutes and deactivate all special rules (you don't want massive inductions for the other teams or the get the ref or riot kick-off events).
Import your orc team and the goblin opponents from your save games.

During the game, get yourself the ball, bring your ball carrier to the middle of the pitch and set all your players to the middle mode (not offensive/defensive), so that they come to the middle of the pitch. Most of the gobbos will attack your bulk of orcs and get smashed, all you have to do is watch your ball carrier and recapture the ball if your carrier falls.
If many of the goblins are KO'ed, you should score some TD's and set up again, so that the goblins can recover. You should also foul grounded goblins whenever possible for some extra KO's/casualties.
Also try not to lose the ball (neither score a TD) after the 4 minute time of the half is up, because time will run on for up to one minute if you keep the ball on your player (more time to smash those goblins).

These four achievements still require some luck, so repeat this one-off match procedure until you have them all.

Just score a TD as soon as you can, then controll the ball.

Then every turn Foul the opposition untill you have 5 sent off.

As long as you dont conseed a TD you'll get this at the end of the match.

Keep your fingers crossed you dont get the 'Get the Ref' Kick-Off result since no one will then be sent off!

Faîtes un match simple en mode classique, prenez les orcs et pour L'IA prenez les gobelins, choisir la difficulté facile.
Pour commencer, marquez un touchdown.
Ensuite après avoir marqué, après l'engagement essayez de prendre la balle avec un joueur costaud (Blitzeur, orc noir) pour pas que vos adversaires puissent vous prendre la balle
Enfin, frappé vos adversaires qui sont au sol (compter une faute toutes les deux frappe) pour arrivé à 5 joueurs expulsés.

L'avantage de jouer contre les gobelins/elfs , c'est qu'ils ont plus de chance d'être blessés après un frappe au sol, ce qui compensera leur supériorité numérique.