here's my zoo-wild mammal list. There are probably a few marsupials missing which I've forgotten I have seen in zoos, and in the other direction there may be a couple on there which I only think I have seen in zoos.
Platypus Ornithorhynchus anatinus
Short-beaked echidna Tachyglossus aculeatus
Eastern grey kangaroo Macropus giganteus
Western grey kangaroo Macropus fuliginosus
Common wallaroo (euro) Macropus robustus
Red-necked wallaby Macropus rufogriseus
Agile wallaby Macropus agilis
Whiptail (pretty-faced) wallaby Macropus parryi
Swamp wallaby Wallabia bicolor
Quokka Setonix brachyurus
Woylie (Brush-tailed bettong) Bettongia penicillata
Rufous bettong Aepyprymnus rufescens
Common brush-tailed possum Trichosurus vulpecula
Koala Phascolarctos cinereus
Common wombat Vombatus ursinus
Eastern quoll Dasyurus viverrinus
Tasmanian devil Sarcophilus harrisii
European hedgehog Erinaceus europaeus
Grey-headed flying fox Pteropus poliocephalus
Pacific fruit bat Pteropus tonganus
Samoan fruit bat Pteropus samoensis
Large flying fox Pteropus vampyrus
Lyle's flying fox Pteropus lylei
Indian flying fox Pteropus giganteus
Bornean slow loris Nycticebus menagensis
Spectral tarsier Tarsius tarsier
Horsfield's (Western) tarsier Tarsius bancanus
Yunnan (Black) snub-nosed monkey Rhinopithecus bieti
Proboscis monkey Nasalis larvatus
Banded leaf monkey Presbytis femoralis
Grizzled leaf monkey Presbytis comata
Dusky leaf monkey Trachypithecus obscurus
Silvered leaf monkey Trachypithecus cristatus
Ebony (black) leaf monkey Trachypithecus auratus
Rhesus macaque Macaca mulatta
Crab-eating macaque Macaca fascicularis
Southern pig-tailed macaque Macaca nemestrina
Northern pig-tailed macaque Macaca leonina
Stump-tailed macaque Macaca arctoides
Tibetan macaque Macaca thibetana
Black crested macaque Macaca nigra
Heck's macaque Macaca hecki
Moor macaque Macaca maura
Siamang Symphalangus syndactylus
White-handed (lar) gibbon Hylobates lar
Mueller's (Bornean) gibbon Hylobates muelleri
Western hoolock gibbon Hylobates hoolock
Bornean orangutan Pongo pygmaeus
Sumatran orangutan Pongo abelii
Common tree shrew Tupaia glis
European rabbit Oryctolagus cuniculus
Black (ship) rat Rattus rattus
Brown (Norway) rat Rattus norvegicus
Polynesian rat Rattus exulans
Bush rat Rattus fuscipes
Australian water rat Hydromys chrysogaster
House mouse Mus musculus
Malayan crested porcupine Hystrix brachyura
Asian brush-tailed porcupine Atherurus macrourus
Prevost's squirrel Callosciurus prevostii
Siberian chipmunk Tamias sibirica
Bicoloured giant squirrel Ratufa bicolor
Yellow-throated marten Martes flavigula
Hog badger Arctonyx collaris
Small Indian mongoose Herpestes auropunctatus
Common palm civet Paradoxurus hermaphroditus
Large Indian civet Viverra zibetha
Malay civet Viverra tangalunga
Small-toothed palm civet Arctogalidia trivirgata
Smooth-coated otter Lutrogale perspicillata
Red panda Ailurus fulgens
Bengal tiger Panthera tigris
Flat-headed cat Prionailurus planiceps
Leopard cat Prionailurus bengalensis
Dingo Canis lupus dingo
Red fox Vulpes vulpes
Raccoon dog Nyctereutes procyonoides
New Zealand fur seal Arctocephalus forsteri
Leopard seal Hydrurga leptonyx
Red deer Cervus canadensis
Sambar Cervus unicolor
Rusa Cervus timorensis
Sika Cervus nippon
Eld's deer (Brow-antlered deer) Cervus eldii
Barasingha Cervus duvaucelii
Pere David's deer Elaphurus davidianus
Hog deer Axis porcinus
Common muntjac Muntiacus muntjak
Reeves' muntjac Muntiacus reevesii
Greater mouse deer Tragulus napu
Lesser mouse deer Tragulus kanchil
Banteng Bos javanicus
Gaur Bos gaurus
Water buffalo Bubalus arnee
Lowland anoa Anoa (Bubalis) depressicornis
Argali Ovis ammon
Bharal (Blue sheep) Pseudois nayaur
Siberian ibex Capra sibirica
Chinese (Grey long-tailed) goral Naemorhedus griseus
Takin Budorcas taxicolor
Chamois Rupicapra rupicapra
Wild pig Sus scrofa
Bearded pig Sus barbatus
Babirusa Babyrousa celebensis
Przewalski's horse Equus ferus przewalskii
Malayan tapir Tapirus indicus
Indian rhinoceros Rhinoceros unicornis
Asian elephant Elephas maximus
I have a few more from my last trip, making a total of about 145 mammal species I've seen in both zoos and in the wild:Okay, all of the above plus the following 31 (I think) species since then.
Grey Slender Loris Loris lydekkerianus
Sunda Slow Loris Nycticebus coucang
Red-shanked Douc Pygathrix naemeus
Black-shanked Douc Pygathris nigripes
Annamese Silvered Langur Trachypithecus margarita
Hatinh Langur Trachypithecus hatinhensis
Delacour's Langur Trachypithecus delacouri
Purple-faced Langur Trachypithecus vetulus
Tufted Grey Langur Semnopithecus priam
Lion-tailed Macaque Macaca silenus
Bonnet Macaque Macaca radiata
Toque Macaque Macaca sinica
Pileated Gibbon Hylobates pileatus
Buff-cheeked Gibbon Nomascus gabriellae
Indian Crested Porcupine Hystrix indica
Malabar Giant Squirrel Ratufa indica
Grizzled Giant Squirrel Ratufa macroura
Chinese Ferret-badger Melogale moschata
Crab-eating Mongoose Herpestes urva
Small Indian Civet Viverricula indica
Leopard Panthera pardus
Jungle Cat Felis chaus
Rusty-spotted Cat Prionailurus rubiginosus
Wolf Canis lupus
Golden Jackal Canis aureus
Chital Axis axis
Fea's Muntjac Muntiacus feae
Sri Lankan Mouse Deer Moschiola meminna
Nilgai Boselaphus tragocamelus
Blackbuck Antilope cervicapra
Urial Ovis orientalis (I think I've seen these at Beijing Zoo, but maybe not)
Sugar Glider Petaurus breviceps
Squirrel Glider Petaurus norfolcensis
Sunda Pangolin Manis javanica
Agile Gibbon Hylobates agilis
Assamese Macaque Macaca assamensis
Indochinese Grey Langur Trachypithecus crepusculus
Little Red Flying Fox Pteropus scapulatus