Removed all the limbs of an enemy 'Mech
Destroyed an enemy 'Mech's head with a Called Shot
Won a 4v4 match with all of your 'Mechs being UrbanMechs and lost no 'Mechs
Destroyed 500 'Mechs
Won 50 online matches
Destroyed an UrbanMech with Flamers
Captured a villain
Lost 10 online matches
Destroyed 50 heavy 'Mechs
Destroyed 50 enemy vehicles with melee
Won a skirmish match at the Battle (20m) Lance Value Budget
Recovered an ancient ship
Learned an important secret
Destroyed 50 medium 'Mechs
Played 50 online multiplayer matches
Destroyed 250 'Mechs
Destroyed an enemy 'Mech with Death from Above using an UrbanMech
Destroyed two 'Mechs in the same turn
Destroyed 5 enemy 'Mechs with Death from Above
Missed a Called Shot
Destroyed an enemy Orion with an AC/20 headshot
Won 50 skirmish matches
Won a skirmish match with a Lance Value 5m less than the OpFor's
Won a 4v4 match with all of your 'Mechs being King Crabs and lost no 'Mechs
Won a skirmish match with more than 25m Lance Value on both sides
Established a history
Destroyed an enemy 'Mech's leg with a Called Shot
Destroyed 50 light 'Mechs
Ejected 5 times
Won a 4v4 match with all of your 'Mechs being Locusts
Lost to the AI one time
Destroyed 5 enemy vehicles with melee
Won 100 skirmish matches
Liberated the world of Itrom
Liberated the world of Panzyr
Played 100 online multiplayer matches
Won a skirmish match at the War (25m) Lance Value Budget
Liberated the world of Tyrlon
Destroyed 50 enemy 'Mechs in melee
Won 25 online matches
Destroyed an enemy 'Mech with an Alpha Strike
Liberated the world of Smithon
Made a melee attack on an enemy 'Mech that was knocked prone
Destroyed 50 assault 'Mechs
Played 5 online multiplayer matches
Won a skirmish match using fewer 'Mechs than the AI opponent
Invaded a capital
Discovered ancient technology
Destroyed 20 enemy 'Mechs with Death from Above
Won a skirmish match with a Lance Value 15m less than the OpFor's
Won 10 skirmish matches
Ejected 20 times
Suffered a terrible betrayal
Won a skirmish match at the Clash (15m) Lance Value Budget
Won an online multiplayer match
Won a skirmish match with a Lance Value 10m less than the OpFor's
Removed both arms from an enemy 'Mech
Crowned a rightful ruler
Killed a Pilot without destroying their 'Mech
Won a multiplayer match with three 'Mechs vs. an OpFor with four 'Mechs
Destroyed 50 'Mechs
Won 100 online matches
Your light 'Mech killed an assault 'Mech with a melee attack
Battled someone who has this achievement (and therefore has either battled HBS developer/BT tourney champ Chris Eck or battled someone who battled someone...who has)
Started a war
Destroyed 5 enemy 'Mechs in melee
Destroyed an enemy 'Mech and your own 'Mech while using Death from Above
Completed 10 mercenary contracts
Negotiated for nothing but salvage in a completed contract
Have a 'Mech and its Pilot survive being knocked down, shutdown, and shot in the head
Saved up over 5 million C-bills
Maxed out a MechWarrior's Tactics stat
Destroyed an enemy 'Mech with Flamers
Hired 100 MechWarriors
Maxed out a MechWarrior's Gunnery stat
Won a skirmish match with an Atlas vs four AI Commandos
Removed one arm from an enemy 'Mech
Completed 100 mercenary contracts
Removed both arms and one leg from an enemy 'Mech
Hired 50 MechWarriors
Saved up over 10 million C-bills
Won a skirmish match with three Commandos vs an AI Atlas
Completed your first mercenary contract
Completed 50 mercenary contracts
Maxed out a MechWarrior's Piloting stat
Negotiated for nothing but reputation in a completed contract
Purchased a new 'Mech chassis
Your pilot ignored the safety instructions and destroyed their 'Mech by overheating
Retreated 10 times from a contract before any of your 'Mechs got destroyed
Saved up over 20 million C-bills
Hired 25 MechWarriors
Completed 25 mercenary contracts
Hired five MechWarriors
Retreated once from a contract before any of your 'Mechs got destroyed
Successfully completed a contract using only one 'Mech
Maxed out a MechWarrior's Guts stat
Refitted 25 'Mechs
Refitted a 'Mech with only Energy weapons
Refitted 50 'Mechs
Refitted a 'Mech with the maximum amount of armor
Refitted a 'Mech with only Ballistic weapons
Completed 25 'Mech repair work orders
Refitted a 'Mech with only Support weapons
Refitted a 'Mech other than an Awesome equipped with three or more PPCs
Refitted a 'Mech with only Missile weapons
Watched all of the credits
Destroyed an enemy light 'Mech with a Highlander Death from Above
Built 10 'Mechs by collecting/salvaging their parts
Acquired all 36 launch date 'Mechs
Become Allied with Pirates
Completed your first Career Mode campaign with any rank
Accomplished a Career Mode score at Elite rank
Accomplished a Career Mode score at Legendary rank
Become Allied with the Taurian Concordat
Start a campaign with 'Mechs requiring 8 parts, then complete 10 'Mechs
Complete the campaign with Dekker still alive
Become Allied with House Davion
Your 1st MechWarrior to max out stats with 10s in all skills
Become Allied with House Marik
Accomplished a Career Mode score at Kerensky rank
Completed a contract with one mech remaining and no pilots killed
Become Allied with House Steiner
Completed Career Mode with Iron Man enabled
Become Allied with House Liao
Accomplished a Career Mode score at Veteran rank
Completed a Campaign with Iron Man enabled
Become Allied with the Magistracy of Canopus
Become Allied with House Kurita