IIIT Hyderabad assignments are usually released in a platform called Moodle which has been created solely for the purpose of sharing study materials among the IIIT Hyderabad students. To access this platform you need to be an IIIT Hyderabad student and have connection to IIIT Hyderabad LAN and credentials.
It’s difficult to procure these assignments on the internet as they are available on the institute's intranet only. So, if you aren’t a student here, try getting help from one.