The Engineer Update Title update for Team Fortress 2 has 38 achievements.
Pick up 10,000 waste metal from pieces of destroyed buildings.
Have dispensers you created dispense a combined amount of 100,000 health over your career.
Destroy 25 sappers on buildings built by other team members.
Kill 20 players carrying the intelligence.
Teleport 100 team members into battle.
Manage to get to and then remove a sapper placed on your building while you were several meters away.
Destroy 50 enemy stickybombs lying in range of friendly buildings.
Have a sentry shielded by the Wrangler absorb 500 damage without being destroyed.
Kill 3 enemies with revenge crits without dying.
Kill 10 Snipers with a sentry gun under control of your Wrangler.
Kill 3 cloaked Spies with a sentry gun under control of your Wrangler.
Provide an enemy player with a freeze cam of your guitar playing skills.
Use a revenge crit to kill the enemy player that destroyed your sentry gun.
Smash an enemy player's head in with your guitar.
Achieve 17 of the achievements in the Engineer pack.
Keep a Heavy healed with your dispenser while he gains 5 kills.
Haul a level 3 sentry gun into a position where it achieves a kill shortly after being redeployed.
Have dispensers you built extinguish 20 burning players.
Haul buildings 1 km over your career.
Use your shotgun to finish off an enemy recently damaged by your sentry gun.
Achieve 11 of the achievements in the Engineer pack.
Upgrade 50 buildings built by other team members.
Kill a spy and two sappers within 10 seconds.
Help a single building tank over 2000 damage without being destroyed.
Help a teammate construct a building.
Get 10 assists with another Engineer where a sentry gun was involved in the kill.
Achieve 5 of the achievements in the Engineer pack.
Kill a disguised spy with your Wrench.
Provide an enemy player with a freeze cam of you and the sentry that just killed them.
Have your sentry kill the enemy that just killed you within 10 seconds.
Have a dispenser heal 3 teammates at the same time.
Repair a sentry gun under fire while being healed by a Medic.
Kill 10 enemies outside the normal sentry gun range using the Wrangler.
Rack up 5000 kills with your sentry guns.
Use a sentry gun to kill 25 enemy players that are capturing a point.
Perform 50 repairs and/or reloads on a Sentry gun being Wrangled by another Engineer.
Destroy an enemy Engineer's sentry gun with a sentry under control of your Wrangler.
Repair 50,000 damage to friendly buildings constructed by other players.