Unlock Characters:
The following characters can be unlocked by completing the said number of missions:

Akamaru - Complete 25 Missions
Anko - Complete 50 Missions
Awakened Hinata - Complete 100 Missions
Haku - Complete 40 Missions
Iruka - Complete 15 Missions
Itachi - Complete 55 Missions
Karasu - Complete 35 Missions
Kimimaro - Complete 30 Missions
Mizuki - Complete 20 Missions
Orochimaru - Complete 65 Missions
Sarutobi - Complete 85 Missions
Sasuke: Cursed Seal 2 - Complete 120 Missions
Tayuya - Complete 10 Missions
Tsunade - Complete 75 Missions
Ukon - Complete 5 Missions
Zabuza - Complete 45 Missions