Here is the full list of all 30 Asterix & Obelix: Slap them All! achievements.
Destroy all barrels in Mission 5-2 “Risky Business”.
Destroy all barrels in Mission 3-4 “Holding Out in the Hold” in under 35 seconds.
Use all of Obelix’s attacks in a single mission.
Send an enemy flying in the air before it ever touches the ground.
Score at least 500,000 points on any mission.
Make the Slap Count climb to over 600.
Use all of Asterix’s attacks in a single mission.
Send 5 enemies flying with a single uppercut.
Land 40 hits in a row with a single spin with Asterix.
Ram 10 enemies with a single charge.
Complete a mission playing only as Obelix.
Complete a mission in Freeplay mode.
Complete the adventure mode on the Easy difficulty (or higher).
Complete the adventure mode on the Medium difficulty (or higher).
Complete Act 6 “The Revenge of Julius Caesar”.
Complete Act 5 “Asterix and Cleopatra”.
Complete Act 4 “Asterix in Corsica”.
Complete Act 3 “Asterix in Spain”.
Knock down 10 enemies with a single throw.
Complete Act 2 “Asterix and the Normans”.
Complete Act 1 “Asterix in Britain”.
Stun 5 enemies at the same time.
Complete the first mission.
Complete a mission playing only as Asterix.
Complete the adventure mode on the Hard difficulty (or higher).
Complete the adventure mode on the Hardest difficulty.
Complete mission 6-1 "Rally the Galleys" without getting hit even once (Medium difficulty or higher).
Complete Mission 6-8 “Morituri te salutant” without picking up any food (Medium difficulty or higher).
Destroy all objects in Mission 6-5 “Stomping Through Italy” in under 80 seconds.
Start a mission in co-op mode.