What is the minimum qualification they are asking for?

The criteria depends on your college and their placement terms with Infosys. For most private colleges, the criteria is 10th, 12th and B.Tech/B.E/MCA - 65% or 6.5 with no active backlogs.
The eligibility criteria is more than 68% aggregate in ur B.E and without any backlog at time of attending the selection process. And to add on, it's purely based on the written test that too English will b playing major part as the evaluation process will not carry forward if hvnt got enough% in English.