Well, this may sound like it will happen once in a while, but if you are mindful, you will have many many chances to celebrate your partner's wins - big and small.
It could be dinner at your fav restaurant, sending over some champagne and cake to their workplace, planning a weekend getaway, a small love note telling them how much you appreciate their efforts and how happy and proud you are of them. Celebrating these milestones will not only help you bond better, but also will make you both want to grow better in life - individually and together.