Creatures of Ava

There are a total of 32 characters in the game, 1 of which is yourself. So, you need to photograph 31 characters. Like most other achievements in this game, once you leave a given region, you cannot return to it. So, make sure to grab everyone's photograph before leaving. Thankfully, there is a bit more leeway with this one as they Naam all gather in the main village in the Grasslands. So, you can possibly get any missing photographs there. And you will meet most, if not all IIRC, of these characters through the main story and secondary quests. Just remember to get a snap along the way!

Here they are, and where to find them (approximately) for the first time:

Grasslands
Tabitha - Arsira Village
Nim'ar - Antaris Cliff Temple
Hon'lo - Arsira Village
Ish'ar - Arsira Village
Fen'ti - Arsira Village
Gar'ek - Antaris Hermitage
Ôbon - Arsira Village
Sebb'ti - Arsira Village
Vaeh'ti - Arsira Village
Rimiri - Antaris Hermitage
Ker'am - Southeast of Eastern Bridge
Bay'rash - Mâruba Swamp Sibling Tree
Lar'oc - Antar Dunes Sibling Tree

Jungle
Voor'lo - Talacan
Fus'ar - Talacan
Boh'ti - Talacan
Tuj'ti - Talacan
Duur'ek - Talacan

Swamp
Kham'lo - Lan-Lania
Tri'lo - New Lan-Lania
Gren'ar - New Lan-Lania
Epp'ar - Center of region
Uhck'ti - Lan-Lania Tunnels
Bor'ek - New Lan-Lania
Ûcup - Antaris Swamp Tower
Us'Fur - Lan-Lania
Stapun - Lan-Lania
Lili'wa - Ava's Nostril

Dunes
Ankor'lo - Naam Camp
Ul'ar - Rests of Settlement
Tooq'ti - South of Naam Camp