Guild Wars 2

please help~ at least increase my achievement to 3/5 objective~
when I use mystic forge to combined sunrise and twilight. it should become account bound already. I should got achievement 2/5 right?

I crafted sunrise and twilight. and I combined to eternity.
when I equip my eternity, I only got tier 2 and objective 1/2 in my legendary collector achievement. but I didn’t get tier 3 or tier 4 objective 3/5. why?? I crafted 3 legendary~
please help~