Most of the actors on the film - about a bullied dwarf in an isolated Samoan village standing up for himself and family - were non-professionals.
It was Tamasese's debut feature.
Other winners included rock documentary Shihad: Beautiful Machine (best doco director and editing), and drama The Most Fun You Can Dying (soundtrack, cinematography and production design).
The awards, organised by Hugh Sundae of nzherald.co.nz and Ant Timpson and presented by The New Zealand Herald and Rialto Channel, were put in place after the national television awards dropped film categories from its annual prize-giving.
The awards were judged by a panel of more than overseas film-makers, festival programmers and journalists.
The winners:
Best film
The Orator
Best Self-Funded Film
The Red House
Best Director
The Orator - Tusi Tamasese
Best Cinematography
The Most Fun You Can Have Dying - Crighton Bone
Best Editing
Two Little Boys - Annie Collins
Best Actor
The Orator - Fa'afiaula Sagote
Best Actress
The Orator - Tausili Pushparaj
Best Supporting Actor
Netherwood - Will Hall
Best Supporting Actress
The Orator - Salamasina Mataia
Best Screenplay
The Orator - Tusi Tamasese
Best Score
The Most Fun You Can Have Dying - Grayson Gilmour
Best Sound
The Orator - Tim Prebble, Chris Todd, Richard Flynn, Mike Hedges and Gilbert Lake
Best Production Design
The Most Fun You Can Have Dying - Bruce Everard
Best Makeup Design
The Devil's Rock - Davina Lamont, Sean Foot and Richard Taylor
Best Costume Design
The Orator - Kirsty Cameron
Best Visual Effects
Two Little Boys - Jon Baxter and Puck Murphy
Best Short Film
Honk If You're Horny
Best Short Film Actor
Honk If You're Horny - Andy Anderson
Best Short Film Actress
Whakatiki - Mabelle Dennison
Best Documentary
Maori Boy Genius
Best Documentary Director
Shihad: Beautiful Machine - Sam Peacocke
Best Documentary Cinematography
How Far is Heaven - Christopher Pryor
Best Documentary Editing
Shihad: Beautiful Machine - Cushla Dillon
Best Self-Funded Short Film
In Safe Hands
Best Short Film Cinematography
I'm the One - Bonnie Elliott
Best Short Film Script
Honk If You're Horny - Joe Lonie