What unexpected struggles you didn't realize you would had while gaining all that weight. Along with unexpected achievements
struggles and achievements are often the same thing. Not fitting into booths/clothes/seats, etc. Getting your waddle when walking becomes too tiresome and so on. So often, an achievement or milestone is getting fat enough to earn that struggle. But for unexpected struggles, there is one big one I had no idea of would be so hard...
I didn't think about how deep I'd sink into the bed and get a little stuck. Especially if I've gone to bed overstuffed I have limited movement anyway, but now I've made a huge dip with my fatass it's even harder rolling onto your other side and even harder getting out of bed.