Since the system of unlocking unlockable items through gameplay in FM19 Touch is based on Game Centre/Google Play Games achievements, your device is required to be connected to the internet and logged into the Game Centre/Google Play Games account when you receive the achievement through gameplay, so that the achievement can be registered on Game Centre/Google Play Games and therefore unlocked in the store. We always recommend saving regularly, particularly near the end of a season or when you think you may unlock something so that if you’re offline you can reload that save and try it again when you are able to connect to the internet.