Here is the full list of all 66 CS2D achievements.
Kill someone with the M249 machine gun (bots excluded)
Kill 50 bots
Kill 30 enemies with the AK-47
Kill 10 bots
Humiliate a real enemy by killing them with your knife in multiplayer mode (6+ players)
Spray a spray logo!
Kill 10 enemies (bots excluded)
Kill 50 enemies (bots excluded)
Kill 100 enemies (bots excluded)
Kill 500 enemies (bots excluded)
Kill 1000 enemies (bots excluded)
Kill 5000 enemies (bots excluded)
Kill 100 bots
Kill 500 bots
Kill 1000 bots
Kill 5000 bots
Get 10 kill assists (bots excluded)
Get 50 kill assists (bots excluded)
Get 100 kill assists (bots excluded)
Get 500 kill assists (bots excluded)
Get 1000 kill assists (bots excluded)
Get 5000 kill assists (bots excluded)
Plant C4 and let it explode in a standard mode multiplayer game (6+ players)
Defuse C4 in a standard mode multiplayer game (6+ players)
Plant C4 100 times in standard mode
Finish to defuse C4 last second before it explodes (in standard mode with 6+ players)
Buy weapons and equipment worth 1,000,000$!
Kill an enemy with a sniper rifle and 2x scope (bots excluded)
Kill 4 players in one round, each with a different laser color (bots excluded, 6+ players)
Say "rank" to get your rank on a server
Rescue 25 hostages in standard mode multiplayer games (6+ players)
Kill the VIP in a standard mode multiplayer game (6+ players)
Make it to the escape zone alive as VIP in a standard mode multiplayer game (6+ players)
Spend 1,000,000$ for buildings! (upgrades and repairs excluded)
Build 50 barbed wire!
Build 50 barricades!
Fortify your area with 50 Level III walls!
Kill 30 enemies with the M4A1
Kill 10 enemies with the TMP
Kill 10 enemies with the M3
Kill 25 enemies with the Desert Eagle
No money? Kill 50 enemies with the Glock!
No money? Kill 50 enemies with the USP!
Kill 50 humans with your zombie claws!
Kill 10 enemies with the HE grenade
Kill 10 enemies with H&K's Maschinenpistole 5 aka MP5
Capture and return the enemy flag on a CTF map!
Dominate 10 flag points (DOM maps)!
Humiliate 10 real enemies by killing them with your knife in multiplayer mode (6+ players)
Create and save a playable map in the map editor
Kill 666 zombies (zombie game mode)!
Kill someone with the rocket launcher (bots excluded)
Rescue a hostage in standard mode multiplayer games (6+ players)
Kill 10 enemies with the Steyr AUG
Kill 10 enemies with the AWP
Kill 10 enemies with a bague... err... with the French FAMAS!
Kill 10 enemies with the Israeli IMI Galil
Kill 10 enemies with the HK G3 SG 1 sniper rifle
Kill 10 enemies with the US Ingram Armament MAC-10
Kill 10 enemies with the Belgian FN P90
Kill 10 enemies with the Scout
Kill 10 enemies with the Swiss SIG SG 550
Kill 10 enemies with the Swiss SIG SG 552
Be the first one who kills an enemy in a round (6+ players multiplayer only)
Throw a flash bang!
Throw a flare in a game with fog of war enabled