Missing achievement unlocks

Okay, I was finally able to upload my files, so here are the pictures that I took a few months ago:
First off, I just noticed that a lot of my unlocked achievements for the game are shown differently on the website compared to my Xbox 360! It seems to show that I've unlocked certain achievements ahead of others that I unlocked before them, which doesn't
really make sense! Anyways, I'm missing three achievements and I should have 32/38 achievements unlocked instead of the 29/38 achievements shown unlocked on the website! If you look at the first picture, it says that I've only unlocked 29/38 achievements just
like the website, but if you look at the other pictures, it clearly shows that I have 32/38 achievements unlocked! I unlocked all three of them on 4/6/2013! I'm missing the Kurisu and the Scavenger achievement for 10G that I unlocked right after the Like a
Scavenger achievement, I'm missing the Clear a stage with Kurisu achievement for 10G that I unlocked right after the Travel to Another World achievement, and I'm missing the Kurisu and Phantom Breaker achievement for 10G that I unlocked right after the missing
Clear a stage with Kurisu achievement! Those are the three achievements that I unlocked on 4/6/2013 that I'm missing in that exact order for a total of 30G!
I really hope that my problem will finally be fixed now that I've gone through all that trouble! Thank you for your time! I really appreciate it!

I unlocked achievements after unlocking those missing ones for a few days and they all registered without a problem! The missing achievements never registered with my gamerscore, so the problem never fixed itself!

Achievements are unlocking and are being shown in recent achievements but the game itself is missing from the achievement list

Love revisiting games to unlock missed achievements.

It seems to be hit or miss on which games are unlocking achievements.