Here is the full list of all 10 Last Message achievements.
Finish the game in under 10 minutes
Read magazine in Lobby
Read the last message you will ever read from Josh
Send Oli a picture of you
Have an uninvited guest enter your apartment
Read at least 2 emails
Send a screwdriver to Oli
Clean up 3 items
Visit at least 3 peoples people pages
Arrive home safely