For a good anime that covers the whole manga, consider 'Attack on Titan'. It remains highly loyal to the manga, presenting the same intense action and emotional depth. Some scenes might be presented differently for visual effects, but the core story is maintained.
One anime that does this well is 'Fullmetal Alchemist: Brotherhood'. It sticks closely to the manga, keeping all the key plot points and character developments intact.
I'd say 'Death Note' is a great example. The anime follows the manga very precisely, replicating the tension and complexity of the story without significant deviations. Minor changes are made for the sake of animation but don't impact the main plot.
Chapter 3, "Madam, the eldest young master has been missing for over half a month", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 345, "Mirror Valley Defense Commander Luo Ming, Beast Tide, Great Xia's 6 Armies (Part 3)", is the clearest early answer because it turns Beast Tide's situation into a concrete plot event. It opens with Not counting Long Mountain, East Ridge, and Wuyuan, the three major... and closes on It's heard that the number of Cold Resistance Levels in the Dragon....
Chapter 187, "I Really Need an Apology", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with During the competition, she passed by him numerous times, unfazed by... and closes on Perhaps it was a pig that tripped you;
Chapter 289, "After all, no one else has designs on Grandpa's inheritance but me", is the clearest early answer because Grandpa gets a payoff that changes the stakes. It opens with In the pure white room, a man lay motionless on the hospital bed,...
Chapter 96, "Can't Easily Forgive the Scumbag!", is the clearest early answer because Scumbag gets a payoff that changes the stakes. Early on, Jiang Li's words seemed absurd, yet there also seemed to be a trace.... By the end, Xu Ling couldn't contain her soft sobbing, "How could this happen?.
Chapter 37, "Those in the know anticipate the transformation, while the oblivious think it's a fashion show.", is the clearest early answer because it turns Variety Show Ever's situation into a concrete plot event.
Chapter 47, "This Result Definitely Has Insiders!", is the clearest early answer because it turns Flash Change's situation into a concrete plot event. The chapter gives readers a real answer by opening on Qi is actually second???] [Did the production team make a mistake?
Chapter 342, "This is our Hua Country's archery", is the clearest early answer because it turns Daniel's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Some horses fell in the mud pits and never got up, some remained...
Chapter 458, "Where Did Everyone Go?", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. The chapter turns that into something concrete by moving from On the other side, Su Yinwan also saw Jiang Li's ranking.
Chapter 213, "Shi Xu, You Must Understand How to Balance Meat and Vegetables", is the clearest early answer because it turns Shi Xu's situation into a concrete plot event.