Gallery movies can be unlocked by encountering certain monsters, as well as doing certain things in the game.

Movie	How to unlock
Akantor	Encounter Akantor
Ancient (White) Fatalis Intro	Encounter Ancient Fatalis
Babakonga Intro	Encounter a Babakonga
Cephadrome Intro	Encounter a Cephadrome
Crimson Fatalis Intro	Encounter Crimson Fatalis
Diablos Intro	Encounter a Diablos
Dodobrango Intro	Encounter a Dodobrango
Dos Fango Intro	Encounter a Dos fango
Fatalis Intro	Encounter Fatalis
Giadrome Intro	Encounter a Giadrome
Gizami Intro	Encounter a Gizami
Gravios Intro	Encounter a Gravios
Gypceros Intro	Encounter a Gypceros
Hypnoc Intro	Encounter Hypnoc
Khezu Intro	Encounter a Khezu
Kirin Intro	Encounter Kirin at the Mountain Area
Kusharudaora Intro 1	Do the purple dress lady urgent quest
Kusharudaora Intro 2	ncounter a Kusharudaora in the mountains
Lao Shan Lung Intro	Do the lao shan lung quest requested by the legendary blacksmith
Monoblos Intro	Encounter a Monoblos
Nana Teskatory Intro 1	Do the Nana teskatory urgent quest
Nana Teskatory Intro 2	Do the Nana teskatory quest at the tower
Narugakaruga Intro	Encounter Narugakaruga
Oonazuchi Intro	Encounter Oonazuchi at the Forest Hills Area
Rahjan Intro	Encounter a Rahjan in the Elder Dual Rahjan quest
Rathalos Intro	Encounter a Rathalos
Rathian Intro	Encounter a Rathian
Teo Teskatoru Intro	Encounter Teo teskatoru at the Volcano Area
Ucamulbu Intro	Encounter Ucamulbu
Velocidrome Intro	Encounter a Velocidrome
Volganos Intro	Encounter Volganos
Yamatukami Intro	Encounter Yamatukami
Yian Garuga Intro	Encounter a Garuga
Yian Kut Ku Intro	Encounter a Yian Kut Ku
Zazami Intro	Encounter a Zazami