In Project Management, in addition of PMP certification what other certification I should also target ?

you can take the PMI-RMP (Risk Management Professional), other than PMI, you can take CIPM (Certified International Project Manager) from American Academy of Project Management, you can take CCE/CCC (certified cost engineer/cost consultant). There are lots out there!

It depends in your field of speciality. If you are, for example, specialized in the IT, there are a lot of great certifications, like A+, Security+, Network+, CISSP, CISA, CISM, Cisco certifications, Oracle certifications, and others. Also, you can achieve the PgMP certification if you already have a program management experience

There are many certifications depend on your specialty. There is PMI-RMP for project risk assessor, CCC and CCE for cost control engineer/consultant from AACE.