And what goals did he achieve?
Palermo - sacked!
Pisa - sacked!
Napoli - sacked!
Valencia - sacked!
Marseille - sacked!
Special mention that in one of his few tries, when he managed to stay for more than half a season without getting kicked out, was when he managed to cling to his seat at AC Milan, where he finished 6th and then 5th.
He hasn't achieved anything, and with how the Italian team looks right now, prepare for more disappointments!
Let him be happy, he still can't distinguish Gattuso as a player and as a coach. His achievements as a coach, only the Coppa Italia with Napoli so far. The rest, as you mentioned

Let's try to be realistic, Italy is currently lacking players who are have strong champion mentality after the era of Del Piero, Totti, Maldini, Materazzi, Buffon, even when Gattuso was a player. Italy's target is to qualify for the World Cup, but making Gattuso a coach is a very controversial decision, from very minimal achievements and tends to end in dismissal, this lack of players will make it more difficult for Gattuso to prove that he is capable of being a coach who can save Italy.