Here is the full list of all 40 Rescue: The Beagles Playtest achievements.
Reach level 2
Reach level 5
Reach level 10
Reach level 15
Reach level 20
Rescue 50 beagles in a run
Rescue 100 beagles in a run
Rescue 250 beagles in a run
Rescue 500 beagles in a run
Rescue 1000 beagles in a run
Maximize Aerobics skill
Maximize Goji Digestion skill
Maximize Owl Recruiting skill
Maximize Beagle Magnetism skill
Maximize Toxin Resistance skill
Neutralize 5 enemies while under influence of goji berries
Neutralize 10 enemies while under influence of goji berries
Neautralize 15 enemies while under influence of goji berries
Neautralize 20 enemies while uder influence of goji berries
Encounter a Primarius
Neutralize 10 Primariuses in a run
Retrieve 3 or more captured beagles from a Vivisector
With parachutes depleted, fall on a parachute and open it to land safely
Die only from fatal falls in a run
Die only by losing beagles in a run
Don’t use rope or parachute (Skyline Flow) on at least 5 levels
Eliminate all enemies (Definace Flow) on at least 5 levels
Don't hurt any enemies (Placid Flow) on at least 5 levels
Collect all items (Heap Flow) on at least 5 levels
Collect all owls (Hoot Flow) on at least 5 levels
Don't waste an owl while eliminating all enemies (Raptor Flow) on at least 5 levels
Earn 5 level bonuses on any level
Earn 5 bonuses on level 5 or above
Earn 5 bonuses on level 10 or above
Score half million points
Score one million points
Complete a rain and a snow level in a run
Swim in water
Earn 3 level bonuses on any level
Score 100K points