Firstly name your character and choose relations and then exhaust all "hair" options using mousewheel.

- Offer her a neck rub.
- Offer her a foot massage.
Save 1
- Listen a little longer.
Save 2
- Look up
- Wake her up
- Any choice
- Any choice
- Any choice
- Go Balls deep
- Any choice
- Missionary
- C*m in her p****y!
- Any choice
- Any choice
- Any choice
- Yes!
- Any choice
- Bend over table
- C*m
- C*m inside her
- Any choice
Load Save 1
- Talk to her
- Don't wear panties tomorrow.
Load Save 1
- You want to kiss MC
Load Save 2
- Grab the fork

There, now you should have 100% achievements. The guide might not be the most optimal way to get them all, but hey it gets the job done right?