Left 4 Dead 2 achievements restored with title update

While Left 4 Dead 2 add-on The Sacrifice messed up hours worth of achievements, the latest Left 4 Dead 2 update fixes ’em.

Valve has said progress towards achievement tallies made before players updated to The Sacrifice will be added on to that made since.

Here are the rest of the patch notes:

• In Versus mode Tanks will spawn in stasis until a human player takes over. Tanks in stasis are invisible and invulnerable, and won’t move or attack.
• Tank speed is no longer reduced when on fire.
• Allow players on the Infected team to manually spawn during finales.
• Added a vote option to toggle All-Talk.
• Special Infected that causes a Survivor to stumble into a “ledge hang” situation will receive 50 points.
• Bullets that first pass through an infected character before striking a Survivor are now ignored as friendly fire.
• In Versus mode car alarms will now trigger anytime a Special Infected pulls or stumbles a Survivor into an alarm car.
• Survivor Bots no longer try to melee exploding barrels out of their way.
• Fixed the Sacrifizzle achievement