Here is the full list of all 101 Little hidden city achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
the end of the game
find water_motocycle
find telescope
find traffic light
find VOLGA
find satellite_talk
find flower_palicious
find TV
find camera
find basketball
find inflatable pool
find medical bed
find wheelchair
find tractor
find cat
find gazebo
find sculpture_rock
find slide
find boat_old
find electric car
find bicycle
find power station
find air conditioning
find motorcycle
find swing
find football_ball
find solar_battery
find pointer
find statue
complete a level gas station
find canister_2
find wheel
find part of the train
find extinguisher
find barrel
find muffler
find logs
find haystack
find soona
find hovel
find spare part
find army trailer
find engine
find strut
find wheel_2
find equipment for garage
find Jack
find old car
find canister
pass_level_supermarket
find jacket
find handbag_female
find bananas
find sink
find trolley
find bank_register
find pac_products
find shoe
find stool
find carton
find cake_shocolate
find bucket_washing brush
find soft toy
find moped
find drawer
find fish
find steak_sibs
find basket
find watermelon
find eggplants
pass_level_country house
find log
find watering can
find bucket of apples
find plant_in_roof
find potty
find light
find stairs
find Boots
find tools
find watering can_2
pass_level_busstation
find stroller
find bicycle_old
find bottles
find shoes
find newspaper
find suitcase_opened
find nameplate
find suitcase_02
pass_level_apartment
find umbrella
find strap
find hat
find suitcase
find tube
find bag
find book
find coat
find magnifying_glass
start the game