FLOCK:MASTER FLOCKER

From SteamStats Wiki

You have to adbuct every single animal in every single single player and multiplayer map. Time is not a factor, and you can take as long as needed on each map to complete each one. There are currently 61 single player maps and 17 multiplayer maps.

Tips:
-when you get a perfect adbuction on a map, a giant star will appear and announce it. In the main campaign screen, a star will be over the level to signify a perfect abduction
-again, time is not a factor. Gold, silver, bronze, or null bonuses have zero effect on getting a perfect abduction
-the antennae on the ufo will point to the nearest animal. Use it when you're missing an animal or two that may otherwise be hidden by the landscape.
-the hardest map by far is level 55 in single player. This is because of the sheer number of animals to collect, pushing them over many gaps and jumps, and only having 1 bridge to carry around.

Multiplayer tips:
-multiplayer is not online multiplayer; it is having a second person controlling a second ufo
-the hardest levels are the night time levels in which animals are spread out and the night time predators are out to eat your animals. Make use of the light stones to light up areas so that you can gather all the animals together and protect them from the predators.