Steam recently changed the default privacy settings for all users. This may impact tracking. Ensure your profile has the correct settings by following the guide on our forums.
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Everything looks fine now, you have to run a manual scan after changing the privacy settings otherwise it takes some time to pick up. I've just done that for you.
oh, didnt even know it saves the dates on the achievements too xD
havent looked that up. i ment last played. one game has no date, but on steam it has.