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