With four months to the global showpiece, the tactician is poised to lead the central Africans to success in France where they must find their way past Canada, New Zealand and the Netherlands to qualify from Group E.
"I feel honoured with the appointment," Djeumfa told BBC Sport.
"I'm aware there is a daunting task ahead with the World Cup in France fast approaching.
"We are starting work immediately and we need to have a great preparation ahead of the France event.
"We want to do better than in 2015 and we think we have what it takes to succeed."
Before his appointment, he was Cameroon's fitness coach at Ghana 2018 and has previously coached the country's topflight sides like New Stars, Batafogo and Aigle.
Djeumfa will be seeking to lead Cameroon past their previous last 16 best when they open their second World Cup campaign against Canada on June 10 in Montpellier.