Does that mean it's possible for a player to pop 2 levels in the same skill in one week?
No. It can't happen.
Isn't there an achievement for the double pop?
And it's definitely possible, we already had some players that had double pops, I believe it was inside skills for tall guys with elastic effect bonus.
Größter Knecht aller Zeiten aka His Excellency aka President for Life aka Field Marshal Al Hadji aka Lord of All the Beasts of the Earth and Fishes of the Seas aka aka Conqueror of the Buzzerbeater Empire in Europe in General and Austria in Particular