Sapper - 20 waves

*Alone at The End of The World* From this acheivment you get a beautiful long beard and some glasses with red lentils. You have to do as sapper, 20 waves alone on any map of endless mode. Everyone knows that the best map for endless is La ferme d'En-Haut and the worst map for endless mode is Tyrolean Village. If you are a good sapper, you will play on La ferme. If you are a sapper who knows that on Old Vardo you can do endless mode and knows the place where to build like me, you will be able to do it easier. For me was easier on Old Vardo using just stakes. This acheivment you can do with kills or without kills (using stakes for doing it as pacifist :D)