Don't you also complete weekly achievements? If you get a certain amount of points you get a chest to open that can have items you need for the laedis gear. Something like a chest at 100 points, another at 500 points and so on?
1st chest at 500 TP
2nd chest at 1000 TP
3rd chest at 2500 TP
4th chest at 5000 TP
From the weekly achievement "Expert Tactician"