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