Kill 50 supply worth of units within 15 seconds in a Melee game.
The Back Door
Using warp prisms, warp in 50 units in a single Melee game.
While playing as Zerg, warp in a Zealot in a Melee game.
The easiest way to do this is play as zerg vs a friend playing as protoss. Also possible is playing zerg with a protoss ally; the ally leaves the game and one can use his gateway to make a zealot.(Alternatively, play against a easy or very easy protoss AI. Destroy all of the opponent's buildings except one, without hurting the probes.) Use an infestor to infest a probe, and use it to build a nexus (and a pylon if there's time enough). From this nexus, build a probe, and warp in a pylon, then a gateway. Then you can create a zealot.
Capture 50 enemy units in a single Vortex in a Melee game.
Destroy 20 units with Sniper Rounds in a single League game.
This achievement is a reference to Team Fortress 2's Meet the Sniper video, where the Sniper says "Professionals have standards: be polite, be efficient, and have a plan to kill everyone you meet." In Team Fortress 2, there are achievements titled "Be Polite" "Be Efficient" "Have a Plan" and "Kill Everyone You Meet" but no achievement titled "Professionals Have Standards".
Warp In Madness
Warp in 100 units with Warp Gates in a single League game.
Destroy 40 units with a single unit in a single League game.
Kills made by nukes are count, so this achievement can be earned by droping 2-3 nukes launched by the same ghost.
This achievement is a reference to Team Fortress 2's Meet the Spy video as an introduction to the class 'Spy', who could disguise as enemy players, but also instant kill via backstab and disable buildings (which aren't things the Changeling is capable of).
Lab Rat (Mighty Mouse · Rat Race) • Back in the Saddle (Full Throttle · Brutal Legend) • Rendezvous (First Strike · Zerg Save the Queen) • Bonus Objectives: Umoja • Umoja Missions
Domination (Poached Eggs · No Egg for You) • Fire in the Sky (Red Alert · Conquer & Command) • Old Soldiers (Nuclear Launch Rejected · Recalled Down the Thunder) • Bonus Objectives: Char • Char Missions
Waking the Ancient (A Game of Drones · Rude Awakening) • The Crucible (Epic Meal Time · Can’t Touch This Chrysalis) • Supreme (Endangered Species · Queen of the Jungle) • Bonus Objectives: Zerus • Zerus Missions
Just Getting Inside (Master of Puppets · Spreading the Disease) • Hand of Darkness (Shattered Command · Power Underwhelming) • Phantoms of the Void (The Phantoms Menaced · Stukov Strikes Back) • Bonus Objectives: Skygeirr • Skygeirr Missions
Missions (Umoja Missions • Char Missions • Kaldir Missions • Zerus Missions • Skygeirr Missions • Space Missions) • Visionary • Xel’Naga Secrets • Judgment Day • StarTours • Fashion Statement • Rally the Troops • For the Swarm! • Abathur’s Cookbook • Kerrigan Power • Swarm Domination
Heart of the Swarm • Heart of the Swarm: Normal • Heart of the Swarm: Hard • Heart of the Swarm: Brutal
Smoking Corpses • Leaping Death • Get a Grip • Unchained • Shifted Priorities • Endless Swarm • Where the Wild Things Are • So Many Banelings! • Worker Rush • Surprise! • To The Limit • Spammer • Air Drop • Release The Kraken • Apocalypse Now
Umoja Missions(Mad Dash • Nick of Time • Premature Evacuation) • Char Missions(Shutout • Going, Going, Gorgon! • Home Wrecker) • Kaldir Missions(Psi-lence is Golden • My Coll Bay Explosions • Monster Smash) • Zerus Missions(Whack-A-Brakk • Short Life Expectancy • Whose Queen Reigns Supreme?) • Skygeirr Missions(Once, Twice, Three Times Malady • Dominion Domination • No-toss) • Space Missions(Ludicrous Speed! • Fast Break) • Final Missions(Crash The Party • Missing Link • Speed Bump)